Question 5 :
A container has hydrogen and oxygen mixture in ratio of 1 : 1 by weight, then

Question 8 :
The work done in ergs for the reversible expansion of one mole of an ideal gas from a volume of 10 litres to 20 litres at is

Question 9 :
The enthalpies of the elements in their standard states are assumed to be

Question 11 :
One mole of an ideal gas is expanded isothermally and reversibly to half of its initial pressure. {tex} \Delta \mathrm S {/tex} for the process in {tex} \mathrm { JK } ^ { - 1 } \mathrm { mol } ^ { - 1 } {/tex} is {tex} [ \ell \mathrm { n } 2 = 0.693 \text { and } R = 8.314 , \mathrm { J } / ( \mathrm { mol } \mathrm { K } ) ] {/tex}

Question 12 :
Following reaction occurring in an automobile <br>{tex} 2 \mathrm { C } _ { 8 } \mathrm { H } _ { 18 ( g ) } + 25 \mathrm { O } _ { 2 ( g ) } \rightarrow 16 \mathrm { CO } _ { 2 ( g ) } + 18 \mathrm { H } _ { 2 } \mathrm { O } _ { ( g ) } {/tex}<br> The sign of {tex} \Delta H , \Delta S {/tex} and {tex} \Delta G {/tex} would be

Question 13 :
The molar heat capacity of water at constant pressure, {tex} C{/tex}, is 75 J K{tex}^{-1}{/tex} mol{tex}^{-1}{/tex}. When 1.0 kJ of heat is supplied to 100 g of water which is free to expand, the increase in temperature of water is

Question 14 :
What is the normal boiling point of mercury? Given : <br>{tex}\Delta H^{\circ}_f{/tex}{tex}\mathrm { (Hg, I)} {/tex} = 0; {tex}\mathrm {S°(Hg, I)}{/tex} = {tex}77.4 \mathrm {J/K—mol}{/tex} {tex}\Delta H^{\circ}_f{/tex}{tex}\mathrm { (Hg, g)}= 60.8 \mathrm{kJ/mol};{/tex}{tex}\mathrm {S°(Hg, I)}{/tex} = {tex}174.4 \mathrm {J/K—mol}{/tex}

Question 15 :
{tex}\mathrm{2Zn\ +\ O_2\ \rightarrow\ 2ZnO;\ \Delta}G^\circ = -616 \ \mathrm J {/tex}<br>{tex}\mathrm{2Zn\ +\ S_2\ \rightarrow\ 2ZnS;\ \Delta}G^\circ = -293 \ \mathrm J {/tex}<br>{tex}\mathrm{S_2\ +\ 2O_2\ \rightarrow\ 2SO_2;\ \Delta}G^\circ = -408 \ \mathrm J {/tex}<br>{tex}\Delta G^\circ {/tex} for the following reaction<br>{tex}\mathrm{2ZnS\ +\ 3O_2\ \rightarrow\ 2ZnO\ +\ 2SO_2} {/tex} is

Question 16 :
If enthalpies of formation for C{tex}_2{/tex}H{tex}_{4(g)}{/tex},CO{tex}_{2(g)}{/tex} and H{tex}_2{/tex}O{tex}_{(\ell)}{/tex} at 25{tex}^\circ{/tex}C and 1 atm pressure are 52, -394 and -286 kJ/mol respectively, then enthalpy of combustion of C{tex}_2{/tex}H{tex}_{4(g)}{/tex} will be

Question 17 :
The heats of neutralisation of {tex} \mathrm { CH } _ { 3 } \mathrm { COOH } , \mathrm { HCOOH } , \mathrm { HCN } {/tex} and {tex} \mathrm { H } _ { 2 } \mathrm { S } {/tex} are {tex} - 13.2 , - 13.4 , - 2.9 {/tex} and {tex} - 3.8 \mathrm { kcal } {/tex} per equivalent respectively. Arrange the acids in increasing order of strength

Question 18 :
Hydrogen has an ionisation energy of {tex} 1311 \mathrm { kJ } {/tex} {tex} \mathrm { mol } ^ { - 1 } {/tex} and for chlorine it is {tex} 1256 \mathrm { kJ } \mathrm { mol } ^ { - 1 } . {/tex} Hydrogen forms {tex} \mathrm { H } ^ { + } ( \mathrm { aq } ) {/tex} ions but chlorine does not form {tex} \mathrm { Cl } ^ { + } ( \mathrm { aq } ) {/tex} ions because

Question 19 :
For a given reaction, {tex} \Delta H = 35.5 \ \mathrm { kJ }\ \mathrm { mol } ^ { - 1 } {/tex} and {tex} \Delta S = 83.6\ \mathrm { J }\ \mathrm { K } ^ { - 1 }\ \mathrm { mol } ^ { - 1 } {/tex} . The reaction is so spontaneous at (Assume that {tex} \Delta H {/tex} and {tex} \Delta S {/tex} do not vary with temperature.)

Question 20 :
In an irreversible process taking place at constant {tex} \mathrm {T } {/tex} and {tex} \mathrm { P } {/tex} and in which only pressure-volume work is being done, the change in Gibbs free energy {tex} \mathrm { (dG) } {/tex} and change in entropy {tex} \mathrm { (dS) } {/tex}, satisfy the criteria

Question 21 :
Given that:<br> (i) {tex} \Delta _ { \mathrm { f } } \mathrm { H } ^ { \circ } {/tex} of {tex} \mathrm { N } _ { 2 } \mathrm { O } {/tex} is {tex} 82 \mathrm { kJ } \mathrm { mol } ^ { - 1 } {/tex}<br> (ii) Bond energies of {tex} \mathrm { N } \equiv \mathrm { N } , \mathrm { N } = \mathrm { N } , \mathrm { O } = \mathrm { O } {/tex} and {tex} \mathrm { N } = \mathrm { O } {/tex} are {tex} 946,418,498 {/tex} and {tex} 607 \mathrm { kJ } {/tex} {tex} \mathrm { mol } ^ { - 1 } {/tex} respectively, <br>The resonance energy of {tex} \mathrm { N } _ { 2 } \mathrm { O } {/tex} is:

Question 22 :
The heat of combustion of carbon to {tex} \mathrm { CO } _ { 2 } {/tex} is {tex} - 393.5 \mathrm { kJ } / \mathrm { mol } . {/tex} The heat released upon formation of {tex} \mathrm { 35.2 g } {/tex} of {tex} \mathrm { CO } _ { 2 } {/tex} from carbon and oxygen gas is

Question 23 :
The densities of graphite and diamond at 298{tex}\ \mathrm { K } {/tex} are 2.25 and 3.31{tex}\ \mathrm { g }\ \mathrm { cm } ^ { - 3 } , {/tex}respectively. If the standard free energy difference {tex} \left( \Delta G ^ { \circ } \right) {/tex} is equal to 1895{tex}\ \mathrm { J }\ \mathrm { mol } ^ { - 1 } {/tex}, the pressure at which graphite will be transformed into diamond at 298{tex}\ \mathrm { K } {/tex} is

Question 24 :
Which of the following assumption of kinetic molecular theory states that gases do not have fixed shape?

Question 25 :
The process, in which no heat enters or leaves the system is termed as