Question 1 :
For the precipitation of IInd group cations only the solution is made acidic so that:

Question 2 :
Which of the following will not shift the equilibrium, {tex} \mathrm { N } _ { 2 } + 3 \mathrm { H } _ { 2 } \rightleftharpoons 2 \mathrm { NH } _ { 3 } {/tex} towards product side

Question 3 :
The degree of dissociation of {tex} 0.1 \mathrm { M }\ \mathrm { CH } _ { 3 } \mathrm { COOH } {/tex} in {tex} 0.1 \mathrm { M\ HCl } {/tex} will be {tex} \left[ \mathrm { K } _ { a } \mathrm { (CH } _ { 3 } \mathrm { COOH } \right) = 10 ^ { - 5 } \mathrm { J }] {/tex}

Question 5 :
If at {tex} \mathrm T ^ { \circ } \mathrm C, \ \mathrm K _ { \mathrm w } = 10 ^ { - 12 } {/tex} then an aqueous solution of {tex} \mathrm { pH } {/tex} of {tex}\mathrm{7}{/tex} will be

Question 6 :
A solution which has {tex} 0.1 \mathrm { N } \ \mathrm { NH } _ { 4 } \mathrm { OH } {/tex} and {tex} 0.1 \mathrm { N }\ \mathrm { NH } _ { 4 } \mathrm { Cl } {/tex} has {tex} \mathrm { pH } = 9.25 . {/tex} The {tex} \mathrm { pK } _ { \mathrm { b } } {/tex} of {tex} \mathrm { NH } _ { 4 } \mathrm { OH } {/tex} is :-

Question 7 :
The solubility of {tex}\mathrm {AgBr}{/tex} in hypo solution is due to the formation of

Question 8 :
5 mL of 0.4 N NaOH is mixed with 20 mL of 0.1 N HCl. The pH of the resulting solution will be

Question 9 :
A weak acid {tex}\mathrm{HX}{/tex} has the dissociation constant {tex} 1 \times 10 ^ { - 5 } \mathrm { M } {/tex}. It forms a salt {tex}\mathrm{NaX}{/tex} on reaction with<br>alkali. The percentage hydrolysis of {tex} 0.1 \mathrm { M } {/tex} solution of {tex} \mathrm { NaX } {/tex} is :<br>

Question 10 :
In lime kiln, the reversible reaction. CaCO₃ (s) &#8652; CaO(s) + CO₂ (g) proceeds to completion because :

Question 12 :
A vessel at {tex} 1000 \mathrm { K } {/tex} contains {tex} \mathrm { CO } _ { 2 } {/tex} with a pressure of {tex} 0.5 \mathrm { atm } {/tex}. Some of the {tex} \mathrm { CO } _ { 2 } {/tex} is converted into {tex} \mathrm { CO } {/tex} on the addition of graphite. If the total pressure at equilibrium is {tex}0.8\mathrm{atm}{/tex}, the value of {tex} \mathrm { K } {/tex} is:

Question 13 :
For the reaction: {tex} 2 \mathrm { BaO } _ { 2 } ( \mathrm { s } ) \rightleftharpoons 2 \mathrm { BaO } ( \mathrm { s } ) + \mathrm { O } _ { 2 } ( \mathrm { g } ) {/tex} {tex} \Delta \mathrm { H } = + \mathrm { ve }{/tex}. In equilibrium condition, pressure of {tex} \mathrm { O } _ { 2 } {/tex} is dependent on

Question 14 :
The concentration of hydroxyl ion in a solution left after mixing {tex} 100 \mathrm { mL } {/tex} of {tex} 0.1 \mathrm { M } \ \mathrm { MgCl } _ { 2 } {/tex} and {tex} 100 \mathrm { mL } {/tex} of {tex} 0.2 \mathrm { M\ NaOH } {/tex} {tex} \left( \mathrm { K } _ { \mathrm { sp } } \text { of } \mathrm { Mg } ( \mathrm { OH } ) _ { 2 } = 1.2 \times 10 ^ { - 11 } \right) {/tex} is

Question 15 :
Solid {tex} \mathrm { Ba } \left( \mathrm { NO } _ { 3 } \right) _ { 2 } {/tex} is gradually dissolved in a {tex} 1.0 \times 10 ^ { - 4 } \mathrm { M } \ \mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 } {/tex} solution. At which concentration of {tex} \mathrm { Ba } ^ { 2 + } , {/tex} precipitate of {tex} \mathrm { BaCO } _ { 3 } {/tex} begins to form? {tex} \left(\mathrm{ K _ { s p }} \text { for } \mathrm { BaCO } _ { 3 } = 5.1 \times 10 ^ { - 9 } \right) {/tex}

Question 16 :
The standard Gibbs energy change at {tex} 300 \mathrm { K } {/tex} for the reaction {tex} 2 \mathrm { A } \rightleftharpoons \mathrm { B } + \mathrm { C } {/tex} is {tex} 2494.2 \mathrm { J } {/tex}. At a given time, the composition of the reaction mixture is {tex} [ \mathrm { A } ] = \frac { 1 } { 2 } , [ \mathrm { B } ] = 2 {/tex} and {tex} [ \mathrm { C } ] = \frac { 1 } { 2 } . {/tex} The reaction proceeds in the: {tex} [ \mathrm { R } = 8.314 \mathrm { J } / \mathrm { K } / \mathrm { mol } , e = 2.718 ] {/tex}

Question 17 :
Consider the expression {tex} \Delta \mathrm { G } = - \mathrm { RT } \ln \mathrm { K } _ { \mathrm { p } } + \mathrm { RTInQ } _ { \mathrm { p } } {/tex} and indicate the correct statement at equilibrium

Question 18 :
What is the decreasing order of basic strengths of {tex} \mathrm { OH } ^ { - } , \mathrm { NH } _ { 2 } ^ { - } , \mathrm { H } - \mathrm { C } \equiv \mathrm { C } ^ { - } {/tex} and {tex} \mathrm { CH } _ { 3 } - \mathrm { CH } _ { 2 } ^ { - } {/tex}

Question 19 :
A weak acid, {tex} \mathrm { H A} , {/tex} has a {tex} K _ { a } {/tex} of {tex} 1.00 \times 10 ^ { - 5 } {/tex} . If {tex}\mathrm {0.100}{/tex} mol of this acid is dissolved in one litre of water, the percentage of acid dissociated at equilibrium is closest to

Question 20 :
Some inert gas is added at constant volume to the following reaction at equilibrium {tex} \mathrm { NH } _ { 4 } \mathrm { HS } ( \mathrm { s } ) \rightleftharpoons \mathrm {NH_3(g)} + \mathrm { H_2S (g)} {/tex}. Predict the effect of adding the inert gas: