Question 3 :
State true or false.<br/><br/>In redox reactions, oxidation and reduction take place simultaneously.<br/>
Question 6 :
The substance that initially involved in a chemical reaction is called a reactant.
Question 7 :
When chlorine reacts with sodium bromide the solution turns brown because ________.
Question 8 :
Aqueous solutions of magnesium chloride and silver nitrate are mixed to form solid silver chloride and aqueous magnesium nitrate.<br/><br/>The balanced molecular equation contains which one of the following terms?
Question 9 :
Balanced chemical equations imply which of the following?<br>$I$. Numbers of molecules are conserved in chemical change<br>$II$. Numbers of atoms are conserved in chemical change.<br>$III$. Mass is conserved in chemical change.
Question 13 :
$KXO_3$(s) well mixed with water, temperature of solution falls. This reaction is:<br/>
Question 14 :
Which of the following reaction requires oxygen to be a reactant ?
Question 15 :
A less reactive metal replaces a more reactive metal from its salt solution in water.<br>
Question 16 :
Reaction of iron nails with copper sulphate solution is an example of ____________.
Question 17 :
A chemical reaction in which heat is evolved is called a/an:<br/>
Question 18 :
Which of the following is an example of the exothermic reaction ?
Question 20 :
Name the type of the following chemical reaction.$2KClO_3 \rightarrow 2KCl +3O_2$
Question 21 :
State true or false.<br/>In a chemical equation, the products are written on the left-hand side and the reactants on the right-hand side with an arrow in between.
Question 23 :
Which of the following symbol is used to show solid precipitate?
Question 25 :
What is the difference between displacement over double displacement reactions ?
Question 26 :
In the reaction, $4Fe+3O_2\rightleftharpoons 4Fe^{3+}+6O^{2-}$ Which of the following statements is incorrect?
Question 28 :
$FeCl_3 + 3NaOH \rightarrow 3NaCl + Fe(OH)_3$<br/><br/>The reaction is an example of________.
Question 31 :
An oxidizing agent is always takes part in the reduction process while a reducing agent is always take part in the _______ process.
Question 33 :
Which type of chemical decomposition reaction is the following reaction?<br>$Cu(OH)_2\xrightarrow {heat} CuO+H_2O$
Question 34 :
In $HS^, I^, R-NH_2, NH_3$ order of proton excepting tendency will be:
Question 35 :
The conversion of ${Cr}_{2}{O}_{7}^{2-}$ to ${Cr}^{3+}$ during a chemical reaction is an example of:
Question 36 :
The reaction of hydrochloric acid with zinc oxide to form zinc chloride and water is neutralization reaction. State whether the statement is true or false
Question 38 :
AB + CD $\rightarrow$ AD + BC<br/><br/>The reaction is an example of _________.<br/><br/><br/>
Question 39 :
Identify the type of reaction which will occur based on the information provided about the reactants:<br>${CH}_{4}(g)+{O}_{2}(g)\rightarrow$
Question 40 :
Other signs of a chemical reaction might be an increase in temperature if heat is released or a change in _____.
Question 44 :
Three cations $A, B, C$ are allowed to react with ammonium hydroxide solution. $A$ and $B$ produce a dirty green precipitate and a reddish brown precipitate respectively, both of which do not dissolve on further addition of ${NH}_{4}OH$. $C$ gives pale blue colour precipitate with less amount of ammonium hydroxide and on further addition of ${NH}_{4}OH$, precipitate becomes soluble and deep blue colour solution is formed:
Question 45 : <p>Oils on treating with hydrogen in the presence of palladium or nickel catalyst form fats. This is an example of :</p>
Question 47 :
Formation of nitric oxide from nitrogen and oxygen is a ______ reaction.
Question 50 :
Identify the product(s) which will be formed by using the information provided about the reactants :<br/>${C}_{4}{H}_{10}(g)+{O}_{2}(g) \rightarrow$
Question 54 : <p>Reaction of iron filings with powdered sulfur is a _____ process.<br/></p>
Question 55 :
$\displaystyle CuO+{ H }_{ 2 }\longrightarrow { H }_{ 2 }O+Cu$, reaction is an example of :<br/>
Question 56 :
When sodium sulphate solution reacts with barium chloride solution, the solution after the reaction contains mainly.....
Question 57 :
The law of conservation of mass is valid for which of the following?<br/>(a) Reactions involving oxidation.<br/>(b) Nuclear reactions.<br/>(c) Endothermic reactions.
Question 61 :
Write 'true' or 'false' for the following statement:<br>When potassium iodide solution is added to lead acetate solution a red precipitate is formed
Question 62 :
When lead nitrate is heated, it breaks down into lead monoxide, nitrogen dioxide and oxygen as given below:$2Pb(NO_3)_2\rightarrow 2PbO+4NO_2+O_2$<br/>The above reaction is an example of :
Question 63 :
Calcium oxide reacts vigorously with water to produce slaked lime.<br/>$CaO(s) + H_2O(l) \to Ca(OH)_2(aq)$<br/>This reaction can be classified as:<br/>(A) Combination reaction<br/>(B) Exothermic reaction<br/>(C) Endothermic reaction<br/>(D) Oxidation reaction<br/>Which of the following is the correct option?<br/>
Question 64 :
Select the correct alternative.Which of the following is a decomposition reaction?
Question 65 :
Identify the reducing agent in the redox reaction<br/><br/>$5SO^{2-}_3+ 2MnO^{-}_4 +6H^{+} \rightarrow 5SO^{2-}_4 +2Mn^{2+} +3H_2O$
Question 66 :
Magnesium reacts with acids producing hydrogen and corresponding magnesium salts. In such reactions Mg undergoes.
Question 67 :
How many molecules of $CO_2$ are formed when one molecule of $C_6H_{12}O_6$ is oxidised in our body?
Question 68 :
Breaking of lead bromide into lead and bromine is an example of _____.
Question 69 :
Chlorine gas prepared from concentrated hydrochloric acid and manganese dioxide reacts with $Fe$ by_________to form__________ .
Question 73 :
In a change hydrogen peroxide gives rise' to hydrogen oxide and oxygen. This is an example of:
Question 74 :
The activity of the metal barium is between that of sodium and potassium. It is likely that:
Question 75 :
What type of chemical reaction does the reaction belong to?<br/>Hydrogen sulphide gas reacts with oxygen gas to form solid sulphur and liquid water.<br/>
Question 77 :
When magnesium burns in air, compound of magnesium formed are magnesium oxide and :
Question 78 :
Which of the following are combination reactions?<br>(i)$2 \mathrm{KClO}_{3} \frac{\mathrm{Heat}}{\longrightarrow} 2 \mathrm{KCl}+3 \mathrm{O}_{2}$<br>(ii)$M g O+H_{2} o \rightarrow M g(O H)_{2}$<br>(iii)$4 A 1+3 O_{2} \rightarrow 2 A 1_{2} O_{3}$<br>(iv)$Z n+F e S O_{4} \rightarrow Z n S O_{4}+F e$
Question 80 :
Name the type of following chemical reaction.<br/>$PbO_2 + SO_2 \rightarrow PbSO_4$
Question 81 :
When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. The reaction is an example of:<br/>
Question 82 :
Exposure of silver bromide to sunlight for a long duration turns grey due to:
Question 83 :
The digestion of food in the body is an example of __________ reaction.
Question 85 :
In which of the following compounds, an element exhibits two different oxidation states ?
Question 87 : Match the following:<br/><table class="wysiwyg-table"><tbody><tr><td>Column A<br/>Types of chemical reaction<br/></td><td>Column B<br/>Chemical equations<br/><br/></td></tr><tr><td>(a) Combination reaction</td><td>(i) $CaCO_3\, \overset{A}{\rightarrow}\, CaO\, +\, CO_2$</td></tr><tr><td>(b) Decomposition reaction</td><td>(ii) $2H_2O\, \xrightarrow{Electricity}\, 2H_2\, +\, O_2$</td></tr><tr><td>(c) Displacement reaction</td><td>(iii) $CaO\, +\, CO_2\, \rightarrow\, CaCO_3$</td></tr><tr><td>(d) Analysis reaction</td><td>(iv) $Fe(s)\, +\, CuSO_4(aq.)\, \rightarrow\, FeSO_4\, (aq)\, +\, Cu(s)$</td></tr></tbody></table>
Question 88 :
Identify the type of the reaction.Potassium + Iron oxide $\rightarrow$ Potassium oxide + Iron
Question 89 :
The standard reduction potentials at 298 K for the following half reactions are given against each<br/>$Zn^{2+}(aq)+2e\rightleftharpoons Zn(s)\ -0.762$<br/>$Cr^{3+}(aq)+2e\rightleftharpoons Cr(s)\ -0.740$<br/>$2H^+(aq)+2e\rightleftharpoons H_2(g)\ 0.000$<br/>$Fe^{3+}(aq)+2e\rightleftharpoons Fe^{2+}(aq)\ 0.770$<br/>Which is the strongest reducing agent?
Question 92 :
Identify the reaction from the following in which physical and chemical changes are occurring:
Question 93 :
When zinc is added to $CuSO_4$ solution, copper is precipitated because :<br/>
Question 96 :
If you pour a few drops of petrol on your palm, it will feel cool as the petrol evaporates. This change a/an:
Question 97 :
What is the minimum mass of ${ CaCO }_{ 3 }(s)$, below which it decomposes completely, required to established equilibrium in a $6.50\ litre$ container for the reaction:<br/>${ CaCO }_{ 3 }(s)\rightleftharpoons CaO(s)+{ CO }_{ 2 }(g);\space { K }_{ c }=0.005\ mole/litre$<br/>
Question 98 :
A mixture of propane and benzene is burst completely in excess of oxygen at $110^{o}C$. It result the production of equal volumes of $CO_{2}(g)$ and steam (measured under identical pressure and temperature). Which of the following is correct regarding the original mixture?
Question 99 :
What amount of $BaSO_4$ can be obtained on mixing 0.5 mole $BaCl_2$ with 1 mole of $H_2SO_4$ ?
Question 100 :
What mass of ammonium nitrate should be heated to produce 8.96 litres of steam? [Note : Relative molecular mass of $NH_4NO_3$ is 80]
Question 101 :
How much $CaO$ is to be added to the furnace charge for each $1280\ kg$ of pure $CaC_{2}$ produced ?
Question 102 :
Consider the following statements.<br/><br/>1. If all the reactants are not taken in their stoichiometric ratio, then at least one reactant will be left behind.<br/><br/>2. 2 moles of $H_2(g)$ and 3 moles of $O_2 (g)$ produce 2 moles of water.<br/><br/>3. If equal weights of carbon and oxygen are taken to produce $CO_2$, then $O_2$ is limiting reagent.<br/><br/>The above statements 1, 2, 3 respectively are (T = True, F = False):
Question 106 :
How many grams of ammonium nitrate will be formed in the reaction?
Question 110 :
What is not a mole ratio of $ \displaystyle 6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2$? <br/>
Question 111 :
For the reaction of sodium with water, the balanced equation using the smallest whole numbers has which of the following coefficients?<br/>I. $1$<br/>II. $2$<br/>III. $3$<br/>Select the correct option.<br/>
Question 113 :
An amount of 0.01 mole of $ SO_{2}Cl_{2} $ is hydrolysed completely in sufficientwater (no gas is allowed to escape out ) and the solution is diluted to 200 ml. Which of the following statement is/are correct? (Ag = 108 )
Question 114 :
A metal ($A$) on heating in nitrogen gas gives compound $B$. $B$ on treatment with ${H}_{2}O$ gives a colourless gas which when passed through $Cu{SO}_{4}$ solution gives a dark blue-violet coloured solution. $A$ and $B$ respectively, are :
Question 117 :
The equation which is balanced and represents the correct product is:
Question 118 :
The reaction, when balanced, $m, n, p$ and $q$ are respectively:<br/>$K_2Cr_2O_7+ \ m FeSO_4+n H_2SO_4\rightarrow Cr_2(SO_4)_3+pFe_2(SO_4)_3+K_2SO_4+qH_2O$ 
Question 119 : For the cell $Zn(s) |Zn^{2+} (aq) || M^{x+} (aq) | M(s)$, different half cells and their standard electrode potentials are given below:<br/><table class="wysiwyg-table"><tbody><tr><td>$M^{x+} (aq/M(s))$</td><td>$Au^{3+} (aq)/Au(s)$</td><td>$Ag^+ \, /Ag(s)$</td><td>$Fe^{3+}(aq)/Fe^{2+} (aq)$</td><td>$Fe^{2+}(aq)/Fe(s)$</td></tr><tr><td>$E^o_{M^{x+}/M^{/(V)}}$<br/></td><td>$1.40$</td><td>$0.80$</td><td>$0.77$</td><td>$-0.44$</td></tr></tbody></table><br/>If $E^o_{Zn^{2+}/Zn} = -0.76 V$, which cathode will give a maximum value of $E^o_{cell}$ per electron transferred ?
Question 120 :
We know that balancing of a chemical equation is entirely based on the law of conservation of mass. However the concept of Principle of Atom Conservation (POAC) can also be related to law of conservation of a mass in a chemical reaction. So, POAC can also acts as a technique for balancing a chemical equation. For example, for a reaction $ABC_3 \rightarrow AB +C_2$ On applying POAC for A, B and C and relating the 3 equation we get : $\dfrac {n_{ABC_3}}{2}=\dfrac {n_{AB}}{2}=\dfrac {n_{C_2}}{3}$ (N= number of moles of X) Thus the coefficients of $ABC_3$, AB and $C_2$ in the balanced chemical equation will be 2,2 & 3 respectively and the balanced chemical equation can be represented as :$2ABC_3 \rightarrow 2AB +3C_2$Now answer the following question.<br/> <br/>If the weight ratio of C and $O_2$ present is 1:2 and both of the reactants completely cousumes and form CO and $CO_2$ and we will obtain a gaseous mixture of CO and $CO_2$ . What would be the weight ratio of CO and $CO_2$  in mixture?
Question 121 :
Which of the following chemical reaction is balanced as well as is combustion reaction?
Question 122 :
A quantity of $12\ g$ of magnesium is burnt completely in air $(O_{2}=20\%$ and $N_{2}=80\%$ by volume). Which of the following is/are correct statement(s) regarding this combustion?
Question 123 :
Minimum amount of $Ag_2CO_3$ (s) required to produce sufficient amount of oxygen for the complete  combustion of $C_2H_2$ which produces 11.2 L of $CO_2$ at STP after combustion is_________.<br/>$Ag_2CO_3 (s) \, \rightarrow\, 2Ag (s)\, +\, CO_2 (g)\, +\, \dfrac12 O_2 (g)$<br/>$C_2H_2\, +\, \dfrac52 O_2\, \rightarrow\, 2CO_2\, +\, H_2O$<br/>
Question 124 :
A quantity of $6\ g\ NaOH$ and $4.4\ g\ CO_{2}$ is allowed to react to form $Na_{2}CO_{3}$ or $NaHCO_{3}$ or both. Which of the following is correct statement regarding the reaction?
Question 125 :
A quantity of 5.68 g of pure $ P_{4}O_{10} $ is dissolved completely in sufficient water and the solution is diluted to 250 ml. Which of the following statement (s) is/are correct?
Question 126 :
If the value of $n$ is $2$, then the atomic weight of metal $M$, is
Question 128 :
The solution of bleaching powder in water is always a clear solution.<br/>
Question 132 :
When the soil is too basic, plants do not grow well in it. To improve its quality what must be added to the soil?
Question 134 :
Water of crystallization is the fixed number of water molecules chemically attached to a unit of a salt in its crystalline form.<br/>
Question 135 :
$1.0 \ L$ solution is prepared by mixing $61 \ gm$ benzonic acid $(pK_a = 4.2)$ with $72 \ gm$ of sodium benzoate and then $\text{300 mL 1.0 M HBr}$ solution was added. the $pH$ of final solution is:-
Question 138 :
$p{ K }_{ a }$ values of four acids are given below at ${ 25 }^{ o }C$. The strongest acid is:
Question 139 :
Which part of tooth, made up of calcium phosphate, is the hardest substance in the body?
Question 141 :
In which of the following reactions does conc.${ H }_{ 2 }S{ O }_{ 4 }$ act as an oxidising agent?
Question 143 :
Effervescence is seen when a bottle of soda water is opened.
Question 144 :
The hydrogen ion concentration of the oceans is about $2\times10^{-9}\space M$. What is the $pH$?
Question 145 :
If $H^{+}$ion concentration of a solution is increasedby $10$ times, its $pH$ will :<br>
Question 146 :
Calculate the pH of a solution which is 0.1 M in HA and 0.5M in NaA. Ka for HA is $1.8\times { 10 }^{ -6 }$?
Question 151 :
Statement I: A basic solution has more hydrogen ions than an acidic solution.<br/>Statement II: pH is defined as the -log $[H^+]$.<br/>
Question 154 :
Which colour appears when few drops of phenolphthalein put into test tube contains lime water?
Question 155 :
The acid present in the body of red ant is ________.<br/>
Question 156 :
If tartaric acid is not added in baking powder, the cake will taste bitter due to te presence of -
Question 157 :
Which of the following methods is adopted for preparing dilute solution of ${ H }_{ 2 }S{ O }_{ 4 }$?
Question 158 :
Assertion: pH of a neutral solution is always $7$.
Reason: pH of a solution does not depend upon temperature.
Question 159 :
When $NH_{3}(0.1\ M) 50\ ml$ mix with $HCl (0.1\ M)\ 10\ ml$ then what is $pH$ of resultant solution $(Pk_{b} = 4.75)$.
Question 162 :
Aquaregia is prepared by mixing conc. $HCl$ and $conc. HNO_3$ in the ratio ________ 
Question 164 :
The chloride salt of a certain weak monoacidic organic base is hydrolysed to an extent of $3$% in its $0.1M$ solution at ${25}^{o}C$. Given that the ionic product of water is ${10}^{-14}$ at this temperature, what is the dissociation constant of the base?
Question 167 :
$pK_{a}$ of acetic acid is <b>4.741</b>. The concentration of $CH_{3}COONa$ is <b>0.01</b> M. The pH of $CH_{3}COONa$ is?
Question 168 :
Four solutions A, B, C and D when tested with universal indicator showed pH as $4, 11, 7$ and $9$ respectively. Which one of the four solutions is neutral?<br/>
Question 170 :
A solution prepared by dissolving 2.8 gm of lime. $CaO$ in enough water to make 1 00 L of lime water $ (Ca(OH)_{2}(aq.)) $. If solubility of $ Ca(OH)_{2} $ in water is 1 48 gm. The $pH$ of the solution obtained will be: <br/>[log 2 = 0.3, Atomic masses are $Ca = 40 ,\ O = 16,\ H= 11$] <br/>
Question 172 :
Which of the following solution will have a $pH$ exactly equal to 8?
Question 173 :
Assertion: pH of acidic solution is always below 7 at $25^oC$.
Reason: At $25^oC$, the pH of $10^{-8} M\ HCl$ is 8.
Question 175 :
The amount of chlorine obtained from a sample of bleaching powder by treatment with excess of dilute acidor $ \displaystyle CO_{2}$ is called available chlorine.
Question 177 :
For making cake, baking powder is taken. If at home your mother uses baking soda instead of baking powder in cake, how will it affect the taste of the cake?<br/>
Question 178 :
The balanced equations for :"Carbon dioxide is passed through a concentrated aqueous solution of sodium chloride saturated with ammonia".
Question 179 :
When sample of baking soda is strongly ignited in crucible it suffered loss in weight of  $3.1 g $  the mass of baking soda is- 
Question 185 :
State whether the given statement is true or false:<br/>Water of crystallization is the water that occurs inside crystals.
Question 186 :
Which of the following has the highest value of pH at the same temperature for the same concentration?
Question 187 :
Sodium hydrogen carbonate when added to acetic acid evolves a gas. Which of the following statement are true about the gas?<br>(i)It turns lime water milky<br>(ii)It extinguishes a burning splinter<br>(iii)It dissolves in a solution of sodium hydroxide<br>(iv)It has a pungent odour
Question 188 :
To 250.0 mL of M/50$H_{2}SO_{4}$, 4 g of solid $NaOH$ is added and the solution is diluted to 1.0 L. The pH of the resulting solution is:
Question 190 :
Since there are 10 water molecules in washing soda, hence it is known as:
Question 193 :
$K_a$ for $CH_3COOH$ is $1.8\times 10^{-5}$ and $K_b$ for $NH_4OH$ is $1.8 \times 10^{-5}$. The pH of ammonium acetate will be:<br/>
Question 195 :
The reaction of $NaCl$ and $CaCO_3$ gives sodium carbonate. But this reaction cannot be used for the manufacture of washing soda since it is a reversible reaction.<br/>
Question 197 :
Which of the following items are not bleached by bleaching powder?
Question 199 :
What is the hydroxide ion concentration in a solution with a pH of 5?
Question 200 :
The pHof a soft drink is $3.82$. The hydrogen ion concentration wil be: (given antilog $0.18=1.5$)
Question 201 :
The ionization constant of a monobasic acid is $2.24\times 10^{-2}$. The $pH$ of $0.01\ M$ acid solution is:
Question 203 :
Assertion: At ${ 25 }^{ o }C$, the pH of ${ 10 }^{ -8 }M$ $HCl$ is $8$.
Reason: pH of acidic solution is always below $7$ at ${ 25 }^{ o }C$.
Question 204 :
Assertion: Sodium bicarbonate is an acidic salt.
Reason: It gives basic solution in water.
Question 208 :
Washing soda on strong heating gives sodium oxide and carbon dioxide.<br/>
Question 209 :
The pH of a ${10}^{-8} M$ solution of ${CH}_{3}COOH$ would be:
Question 210 :
Calamine is used to reduce the irritating effect of ant bite/sting because it reacts with (X) released due to the bit /sting of ants with (Y) present in calamine. (X) and (Y) respectively are:
Question 211 :
Which of the following salts does not contain water of crystallisation ?
Question 212 :
Consider the following reactions:$CaCO_3\rightarrow CaO+CO_2$ <br> $E+CO_2\rightarrow F$ <br> $NaCl+F\rightarrow A+NaHCO_3$where $E$ and $F$ are respectively :
Question 214 :
$ CaOCl_2 + H_2O + CO_2 \longrightarrow CaCO_3 + CaCl_2 + HOCl$ This reaction is simply:
Question 215 :
$CO_2$ gas along with solid $(Y)$ is obtained when sodium salt $(X)$ is heated. $(X)$ is again obtained when $CO_2$ gas is passed into aqueous solution of $(Y)$. $(X)$ and $(Y)$ respectively are :
Question 217 :
Bleaching powder is obtained by the interaction of $Cl_2$ with a:
Question 218 :
State whether the given statement is true or false:<br/>Bleaching powder contains about 50 % available chlorine.<br/>
Question 219 :
The first and second dissociation constants of an acid $H_{2}A$ are $1.0\times 10^{-5}$ and $5.0\times 10^{-10}$ respectively. The overall dissociation constant of the acid will be:
Question 220 :
$NaHCO_{3}$ can be used on its own to make cakes or bread. Baking powder is more commonly used, and contains $NaHCO_{3}$, $Ca(H_{2}PO_{4})_{2}$ and starch. An improved combination baking powder contains about 40% starch, 30% $NaHCO_{3}$ 20% $NaAl(SO_{4})_{2}$ and 10% $Ca(H_{2}PO_{4})_{2}$Answer the following questions based on above study.<br/><br/>In improved baking powder, $NaAl(SO_{4})_{2}$ is used for :
Question 222 :
The more commonly used baking powder contains about 30% $NaHCO_3$, 20% $NaAl(SO_4)_2$, 10% $Ca(H_2PO_4)_2$ and 40% starch. Which of the following statements are correct?<br/>
Question 223 :
The $pH$of $0.1 M$ solution of the following salts increases in the order
Question 224 :
To $1.0 L$ solution containing $0.1$ mol each of $NH_3$ and $NH_4Cl, 0.05$ mol NaOH is added. The change in pH will be : $(pK_a$ for $CH_3 COOH=4.74$)
Question 225 :
When ethyl alcohol is heated with a paste of bleaching powder, we get a compound in which the function of bleaching powder is: 
Question 226 :
The indicator constant for an acidic indicator , HIn is $ 5 \times 10^{-6}  M $. this indicator appears only in the colour of acidic from when $ \frac { [In^- ] }{ [HIn]} \le \frac {1}{20} $ and it appears only in the colour of basic form when $ \frac { [HIn]}{[In^-]} \le \frac {1}{40} . $ the pH range of indicator is:
Question 227 :
$NaHCO_{3}$ can be used on its own to make cakes or bread. Baking powder is more commonly used, and contains $NaHCO_{3}$, $Ca(H_{2}PO_{4})_{2}$ and starch. An improved combination baking powder contains about 40% starch, 30% $NaHCO_{3}$ 20% $NaAl(SO_{4})_{2}$ and 10% $Ca(H_{2}PO_{4})_{2}.$ Answer the following questions based on above study.<br/>$Ca(H_{2}PO_{4})_{2}$ in baking powder:
Question 228 :
Which one of the following solutions will have the highest pH value?
Question 230 :
Dissociation constants of $CH_3COOH$ and $NH_4OH$ in aqueous solution are $10^{-5}$. If pH of a $CH_3COOH$ solution is $3$. What will be the pH of $NH_4OH$?
Question 233 :
The third dissociation constant of $H_{3}PO_{4}$ is $1.3\ \times 10^{-12}$. Assume that the hydrolysis proceeds only in the first step, the $pH$ of $0.1\ M\ K_{3}PO_{4}$ solution is:
Question 234 :
The ions responsible for the bleaching action of bleaching powder and the ions responsible for loss of bleaching action of bleaching powder due to the storage for long time respectively are:<br/>
Question 236 :
The $pH$ of $HCl$ is 1. $1.10\ ml$ of this solution is reacted with $40\ ml$ of $NaOH$ solution whose $pH=12$. The $pH$ of resulting solution is: $(\log(1.2)=0.108)$<br/>
Question 237 :
$1\ cc$ of $0.1N$ $HCl$ is added to $1$ litre solution of sodium chloride. The $pH$ of the resulting solution will be:
Question 238 :
$1.0$ ml of a solution of $HCl$ with a $pH$ of $4.0$ is added it to $9.0$ ml of distilled water, the $pH$ of the final solution will be:
Question 239 :
$\dfrac{N}{10}$ acetic acid was titrated with $\dfrac{N}{10}$ $NaOH$. when 25%, 50% and 75% of titration is over then the $pH$ of the solution will be (respectively): $[K_a = 10^5]$ 
Question 240 :
Substance $X$:<br/>(I) reacts with $H_2S$ to produce white turbidity.<br/>(II) changes light green solution of $FeSO_4$ into yellow colour.<br/>(III) reacts with moisture to give pungent smelling gas.<br/>Hence $X$ is:
Question 241 :
The $pH$ at which a 0.01 M ${ Al }^{ +3 }$ solution is 99.99% precipitated is: $\left( { K }_{ sp } \ \ Al\left( OH \right) _{ 3 }=1\times { 10 }^{ -18 }at\quad 25 \right) $
Question 243 :
Number of $OH^-$ in 1 mL solution of pH = 13 is:
Question 245 :
One mole of ammonia was completely absorbed in one litre solution each of<br/>I. $1\ M\ HCl$<br/>II. $1 \ M\ CH_3COOH$ <br/>III. $1\ M\ H_2SO_4$ at $298$ K<br/>The decreasing order for the $pH$ of the resulting solution is:(Given: $K_b (NH_3) = 4.74$)
Question 246 :
The aqueous solution of which one of the following is basic?
Question 247 :
The $pH$ of a ${ 10 }^{ -9 }\ M$ solution of $HCl$ in water is :<br>
Question 248 :
What is the correct increasing order of the $pH$ values of the following solutions with equal concentrations?
Question 249 :
The $pH$ of a buffer solution containing equal molar concentration of a week base and its chloride ($K_{b}$ for weak base $=2\times 10^{-5}$) is :
Question 251 :
When chlorine is passed over dry slaked lime at room temperature, the main reaction product is:
Question 252 :
Which is the correct for the following reaction: <br/>$B\, (OH)_3\, +\, H_2O\, \rightarrow \, [B(OH)_4]^-\, +\, H^+$
Question 254 :
$NaHCO_{3}$ can be used on its own to make cakes or bread. Baking powder is more commonly used, and contains $NaHCO_{3}$, $Ca(H_{2}PO_{4})_{2}$ and starch. An improved combination baking powder contains about 40% starch, 30% $NaHCO_{3}$ 20% $NaAl(SO_{4})_{2}$ and 10% $Ca(H_{2}PO_{4})_{2}.$ Answer the following questions based on above study.<br/>Rise in bread and cakes is due to______ when it decomposes between $50^{o}C$ and $100^{o}C$. 
Question 255 :
Baking powder used to make a cake is a mixture of starch, $NaHCO_3$ and $Ca(H_2PO_4)_2$. The function of $Ca(H_2PO_4)_2$ is:<br/>
Question 256 :
Iso-electric point of alanine is (pH = $6$). At which pH, maximum concentration of zwitter ion of alanine will be present?
Question 257 :
Percentage ionisation of water at certain temperature is $3.6\times { 10 }^{ -7 }$%. Calculate ${K}_{w}$ and $pH$ of water.
Question 258 :
The $pH$ of $0.1M$ solution of the following salts increases in the order:
