Question 3 :
Which colour appears when few drops of phenolphthalein put into test tube contains lime water?
Question 4 :
If $H^{+}$ion concentration of a solution is increasedby $10$ times, its $pH$ will :<br>
Question 6 :
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 7 :
The hydrogen ion concentration of the oceans is about $2\times10^{-9}\space M$. What is the $pH$?
Question 8 :
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 9 :
$pK_{a}$ 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 10 :
Aquaregia is prepared by mixing conc. $HCl$ and $conc. HNO_3$ in the ratio ________ 
Question 14 :
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 15 :
$p{ K }_{ a }$ values of four acids are given below at ${ 25 }^{ o }C$. The strongest acid is:
Question 16 :
Assertion: pH of a neutral solution is always $7$.
Reason: pH of a solution does not depend upon temperature.
Question 17 :
Which of the following methods is adopted for preparing dilute solution of ${ H }_{ 2 }S{ O }_{ 4 }$?
Question 18 :
The acid present in the body of red ant is ________.<br/>
Question 20 :
Water of crystallization is the fixed number of water molecules chemically attached to a unit of a salt in its crystalline form.<br/>
Question 25 :
Which part of tooth, made up of calcium phosphate, is the hardest substance in the body?
Question 26 :
$1.0 \ L$ 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 27 :
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 28 :
Effervescence is seen when a bottle of soda water is opened.
Question 29 :
If tartaric acid is not added in baking powder, the cake will taste bitter due to te presence of -
Question 30 :
In which of the following reactions does conc.${ H }_{ 2 }S{ O }_{ 4 }$ act as an oxidising agent?
Question 34 :
The solution of bleaching powder in water is always a clear solution.<br/>
Question 39 :
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 42 :
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 43 :
What is the nature of solution at ${60}^{o}C$ whose $pH$ is $6.35$?
Question 44 :
The cell, $Pb | H_{2}(1\ atm)|| H^{+} (pH = x)|$<br/>normal calomel electrode, has an emf of $0.67$ volt as $25^{\circ}C$. Calculate the $pH$ of the solution. The oxidation potential of calomel electrode on the hydrogen scale is :$-0.28\ volt$.
Question 45 :
What is the $pH$ of a solution that contains $0.1\ mol/L$ of ${H}_{3}{O}^{+}$ ions?
Question 50 :
How would you distinguish between baking powder over washing soda by heating?<br/>
Question 51 :
The pair whose both species are used in antacid medicinal preparation is<br>
Question 52 :
In Solvay ammonia process, sodium bicarbonate is precipitated due to :
Question 55 :
The $pH$ of ${10}^{-4} M \ KOH$ solution will be :
Question 56 :
Available chlorine can be liberated from bleaching powder by the reaction with:<br/>
Question 57 :
The pH of an $HCl$ solution is $2$. Sufficient water is added to make the pH of new solutions. The hydrogen ion concentration is reduced:
Question 58 :
The $pH$ value of $0.001\ M$ aqueous solution of $NaCl$ is:<br/>
Question 59 :
The average oxidation state of chlorine in bleaching power is :
Question 60 :
0.24 g sample of $Mg$ react with 80.0 mL of $HCl$ solution whose $pH$ is 0.30. $pH$ after all $Mg$ has reacted is:
Question 61 :
$CaCO_3 \rightarrow CaO +CO_2$ <br> $E + CO_2 \rightarrow F$ <br> $NaCl + F \rightarrow A+ NaHCO_3$The other compound formed with sodium bicarbonate is:<br/>
Question 62 :
What is the $pH$ of a $0.200$ M solution of $C_6H_5COONa$? (The $K_a$ of $C_6H_5COOH$ is $6.4\times 10^{-5}$)
Question 63 :
${ H }_{ 2 }O+{ H }_{ 3 }{ PO }_{ 4 }\rightleftharpoons { H }_{ 3 }{ O }^{ + }+{ H }_{ 2 }{ PO }_{ 4 }^{ - };  \ \ \ \ p{ K }_{ 1 }=2.15$<br/>${ H }_{ 2 }O+{ H }_{ 2 }{ PO }_{ 4 }^{ - }\rightleftharpoons { H }_{ 3 }{ O }^{ + }+{ H }_{ 2 }{ PO }_{ 4 }^{ 2- };\ \ \ p{ K }_{ 2 }=7.20$<br/>Hence, pH of $0.01M$ $Na{ H }_{ 2 }{ PO }_{ 4 }$ is:
Question 69 :
The gatric juice in our stomach contains enough $HCl$ to make the hydrogen ion concentration about $0.01\ mol .L^{-1}$. The pH of gastric juice is:
Question 70 :
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 71 :
1.458 g of $Mg$ reacts with 80.0 mL of $HCl$ solution whose $pH$ is $- 0.477$. The change in $pH$ after all $Mg$ has reacted is: (Assume constant volume. $Mg = 24.3$ g $mol^{-1}$ and $log 3 = 0.477$)
Question 72 :
What is used as a bleaching linen, wood pulp and washed clothes in laundry?
Question 74 :
A given weak acid (0.10 M) had $pK_{a}=6$. The pH of the solution is:
Question 75 :
The pair of the solutions which have pH value less than 7 is:
Question 76 :
1 c.c of 0.1 N $HCl$ is added to 1 litre solution of sodium chloride. The pH of the resulting solution will be:<br/>
Question 79 :
$ CaOCl_2 + H_2O + CO_2 \longrightarrow CaCO_3 + CaCl_2 + HOCl$ This reaction is simply:
Question 80 :
$100$ml of $0.2$M $HCl$ are mixed with $100$ ml of $0.2M CH_3COONa$, the $pH$ of the resulting solution would be nearly:
Question 83 :
State whether the given statement is true or false:<br/>Water of crystallization is the water that occurs inside crystals.
Question 84 :
By which we can measure the exact $pH$ of aqueous solution?
Question 86 :
$25ml, 0.2M\ Ca(OH)_{2}$ is neutralised by $10\ ml$ of $1M\ HCl$. The $pH$ of resulting solution is:
Question 87 :
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 89 :
One litre solution contains $1 M\ HOCl$ $\displaystyle[K_a = 10 ^{-8}]$ and $1 M\ NaOH$. What is the $pH$ of the solution?
Question 90 :
Bleaching powder is soluble in cold water giving a milky solution due to:
Question 91 :
The element which is not common between the compounds called baking soda and soda ash is:
Question 93 :
Which one of the following solutions will have the highest pH value?
Question 94 :
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 95 :
Which is the correct for the following reaction: <br/>$B\, (OH)_3\, +\, H_2O\, \rightarrow \, [B(OH)_4]^-\, +\, H^+$
Question 96 :
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 97 :
When ethyl alcohol is heated with a paste of bleaching powder, we get a compound in which the function of bleaching powder is: 
Question 98 :
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 99 :
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 100 :
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 102 :
$\dfrac{N}{10}$ 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 103 :
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 104 :
What is the correct increasing order of the $pH$ values of the following solutions with equal concentrations?
Question 105 :
$1.0$ 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 106 :
Iso-electric point of alanine is (pH = $6$). At which pH, maximum concentration of zwitter ion of alanine will be present?
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 :
The $pH$ of a ${ 10 }^{ -9 }\ M$ solution of $HCl$ in water is :<br>
Question 110 :
The $pH$of $0.1 M$ solution of the following salts increases in the order
Question 113 :
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 116 :
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 117 :
$NaHCO_{3}$ 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 118 :
$1\ cc$ of $0.1N$ $HCl$ is added to $1$ litre solution of sodium chloride. The $pH$ of the resulting solution will be:
Question 120 :
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 121 :
$NaHCO_{3}$ 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 122 :
The $pH$ of $0.1M$ solution of the following salts increases in the order:
Question 124 :
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 125 :
The aqueous solution of which one of the following is basic?
Question 126 :
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 127 :
$NaHCO_{3}$ 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 128 :
Number of $OH^-$ in 1 mL solution of pH = 13 is:
Question 130 :
Percentage ionisation of water at certain temperature is $3.6\times { 10 }^{ -7 }$%. Calculate ${K}_{w}$ and $pH$ of water.
Question 132 :
When chlorine is passed over dry slaked lime at room temperature, the main reaction product is:
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: