Question 3 :
Which part of tooth, made up of calcium phosphate, is the hardest substance in the body?
Question 4 :
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 5 :
The hydrogen ion concentration of the oceans is about $2\times10^{-9}\space M$. What is the $pH$?
Question 6 :
Effervescence is seen when a bottle of soda water is opened.
Question 8 :
The acid present in the body of red ant is ________.<br/>
Question 13 :
If tartaric acid is not added in baking powder, the cake will taste bitter due to te presence of -
Question 16 :
Water of crystallization is the fixed number of water molecules chemically attached to a unit of a salt in its crystalline form.<br/>
Question 17 :
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 20 :
$1.0 \ L$ 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 21 :
Which of the following methods is adopted for preparing dilute solution of ${ H }_{ 2 }S{ O }_{ 4 }$?
Question 23 :
$p{ K }_{ a }$ values of four acids are given below at ${ 25 }^{ o }C$. The strongest acid is:
Question 24 :
If $H^{+}$ion concentration of a solution is increasedby $10$ times, its $pH$ will :<br>
Question 25 :
Assertion: pH of a neutral solution is always $7$.
Reason: pH of a solution does not depend upon temperature.
Question 27 :
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 29 :
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 30 :
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 33 :
Aquaregia is prepared by mixing conc. $HCl$ and $conc. HNO_3$ in the ratio ________ 
Question 35 :
Which colour appears when few drops of phenolphthalein put into test tube contains lime water?
Question 36 :
$pK_{a}$ 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 37 :
The solution of bleaching powder in water is always a clear solution.<br/>
Question 39 :
In which of the following reactions does conc.${ H }_{ 2 }S{ O }_{ 4 }$ act as an oxidising agent?
Question 42 :
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 45 :
Which of the following items are not bleached by bleaching powder?
Question 46 :
A salt associated with water of crystallization is known as a:
Question 49 :
${K}_{w}$ for ${H}_{2}O$ is $9.62\times {10}^{-14}$ at ${60}^{o}C$. What is $pH$ of water at ${60}^{o}C$.
Question 51 :
The pair whose both species are used in antacid medicinal preparation is<br>
Question 53 :
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 54 :
A milkman adds a very small amount of baking soda to fresh milk. The pH will :<br/>
Question 58 :
Consider the following statement and select correct option :<br>(l) $K_{sp}$ of $Fe(OH)_3$ in aqueous solution is 3.8 x $10^{38}$ at 298 K. The concentration of $Fe^{3+}$ will increase when $[H^+]$ ion concentration decreases.<br>(ll) In a mixture of $NH_4Cl$ and $NH_4OH$ in water, a further amount of $NH_4Cl$ is added. The pH of the mixture will decreases.<br>(lll) An aqueous solution of each of the following salts $(NH_4l, HCOOK)$ will be basic, acidic respectively.
Question 59 :
State whether the given statement is true or false:<br/>Bleaching powder contains about 50 % available chlorine.<br/>
Question 60 :
Heated calcium sulphate with half a water of crystallization is commonly called as :
Question 62 :
What is the $pH$ of a solution obtained by mixing $10$mL of $0.1$M $HCl$ and $40$ mL of $0.2$M $H_2SO_4$?
Question 63 :
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 66 :
Equal volumes of two solutions with $p{H}=3$ and $p{H}=11$ are mixed. Then the $p{H}$ of the resulting solution is:
Question 68 :
What is the $pH$ of a solution that contains $0.1\ mol/L$ of ${H}_{3}{O}^{+}$ ions?
Question 69 :
If  the solubility product of $MOH$ is $1 \times {10^{ - 10}}\,mo{l^2}d{m^{ - 2}}.$ Then the ${pH}$ of its aqueous solution will be:  <br/>
Question 71 :
The $pH$ of a solution obtained by mixing $50 mL$ of $0.2 M  HCl$ with $50 mL$ of $0.02M$ ${ CH }_{ 3 }COOH$ is:
Question 72 :
On adding 0.04 g solid $NaOH$ to a 100 ml $\dfrac{M}{200} Ba(OH)_{2}$ solution, determine change in $pH$.
Question 73 :
Which of the following salts does not contain water of crystallisation?<br>
Question 74 :
What is the $pH$ of a saturated solution of $X(OH)_3$ will be if its solubility product = $2.7 \times 10^{-43}$?<br/>[Given: log 3 = 0.5, log 2 = 0.3]
Question 75 :
$ CaOCl_2 + H_2O + CO_2 \longrightarrow CaCO_3 + CaCl_2 + HOCl$ This reaction is simply:
Question 76 :
'Sodium bicarbonate solution has $pH$ less than 7.'<br/>State True or False:<br/>
Question 78 :
At $25^0$C, the solubility product of $Mg(OH)_2$ is 1.0 x $10^{-11}$. At which pH, will $Mg^{2+}$ ions start precipiating in the form of $Mg(OH)_2$ from a solution of 0.001 M $Mg^{2+}$ ions?
Question 81 :
Bleaching powder is disinfectant for purification of water when water born germs are killed. But disinfectant activity is destroyed. It is due to its disproportionation into:
Question 82 :
The pH of an aqueous solution of $NaCl$ at $85 ^oC$ should be:
Question 83 :
Washing soda on strong heating gives sodium oxide and carbon dioxide.<br/>
Question 86 :
The $pH$ value of $0.001\ M$ aqueous solution of $NaCl$ is:<br/>
Question 88 :
Assertion: Sodium bicarbonate is an acidic salt.
Reason: It gives basic solution in water.
Question 89 :
The number of molecules of water of crystallisation present in one molecule of ferrous sulphate is_______.
Question 90 :
Bleaching powder should not be used for acidic water as it reacts with them to :
Question 91 :
Copper sulphate pentahydrate is commonly called as_______, whereas ferrous sulphate heptahydrate is commonly called as ________ .
Question 92 :
By which we can measure the exact $pH$ of aqueous solution?
Question 93 :
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 94 :
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 95 :
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 96 :
Percentage ionisation of water at certain temperature is $3.6\times { 10 }^{ -7 }$%. Calculate ${K}_{w}$ and $pH$ of water.
Question 103 :
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 104 :
$1.0$ 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 105 :
When ethyl alcohol is heated with a paste of bleaching powder, we get a compound in which the function of bleaching powder is: 
Question 106 :
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 107 :
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 108 :
$NaHCO_{3}$ 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 109 :
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 111 :
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 112 :
What is the correct increasing order of the $pH$ values of the following solutions with equal concentrations?
Question 114 :
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 115 :
The $pH$ of $0.1M$ solution of the following salts increases in the order:
Question 116 :
Iso-electric point of alanine is (pH = $6$). At which pH, maximum concentration of zwitter ion of alanine will be present?
Question 117 :
$\dfrac{N}{10}$ 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 118 :
Which one of the following solutions will have the highest pH value?
Question 119 :
Which is the correct for the following reaction: <br/>$B\, (OH)_3\, +\, H_2O\, \rightarrow \, [B(OH)_4]^-\, +\, H^+$
Question 121 :
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 122 :
The $pH$ of a ${ 10 }^{ -9 }\ M$ solution of $HCl$ in water is :<br>
Question 123 :
The aqueous solution of which one of the following is basic?
Question 124 :
$NaHCO_{3}$ 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 125 :
When chlorine is passed over dry slaked lime at room temperature, the main reaction product is:
Question 126 :
$1\ cc$ of $0.1N$ $HCl$ is added to $1$ litre solution of sodium chloride. The $pH$ of the resulting solution will be:
Question 127 :
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 128 :
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 129 :
Number of $OH^-$ in 1 mL solution of pH = 13 is:
Question 130 :
The $pH$of $0.1 M$ solution of the following salts increases in the order
Question 131 :
$NaHCO_{3}$ 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 133 :
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:
