Given enthalpy of formation of ${\mathrm{CO}}_2$(g) and CaO(s) are -84.0kJ and -152kJ respectively and the enthalpy of the reaction,

${\mathrm{CaCO}}_3<mspace\; width="1em"></mspace>\left(\mathrm{s}\right)<mspace\; width="1em"></mspace>\to <mspace\; width="1em"></mspace>\mathrm{CaO}\left(\mathrm{s}\right)<mspace\; width="1em"></mspace>+<mspace\; width="1em"></mspace>{\mathrm{CO}}_2<mspace\; width="1em"></mspace>\left(\mathrm{g}\right)<mspace\; width="1em"></mspace>$  is 42 kJ. The enthalpy of formation of $CaC{O}_3$(s) is:

1. -42 kJ

2. -202 kJ

3. +202 kJ

4. -288 kJ

The value of $∆H°$ for the reaction $C{u}^{+}\left(g\right)<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>+<mspace\; width="1em"></mspace>I^{-}\left(g\right)<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>\to <mspace\; width="1em"></mspace>CuI\left(g\right)$  is -446kJ $mo{l}^{-1}$. If the ionisation energy of Cu(g) is 745 kJ $mo{l}^{-1}$  and the electron affinity of I(g) is -295kJ $mo{l}^{-1}$, then the value of $∆H°$  for the formation of one mole CuI(g) from Cu(g) and I(g) is:

(1) -446 kJ $mo{l}^{-1}$

(2) 450 kJ $mo{l}^{-1}$

(3) 594 kJ $mo{l}^{-1}$

(4) 4 kJ $mo{l}^{-1}$

Boiling point of a liquid is 50 K at 1 atm and $∆H_{vap.}=460.6<mspace\; width="1em"></mspace>cal<mspace\; width="1em"></mspace>mo{l}^{-1}$. what will be its b.p at 10 atm?

(1) 150 K 

(2) 75 K 

(3) 100 K 

(4) 200 K 

The work is done in an open vessel at 300 K, when 112 g irone reacts with dil. HCI is:

1.  1.2 kcal

2.  0.6 kcal

3.  0.2 kcal

4.  2 kcal 

A Carnot engine operates between temperature T and 400 K (T > 400 K). If efficiency of engine is 25%, the temperature T is:

1.  400 K

2.  500 K

3.  533.3 K

4.  600 K

The standard change is Gibbs energy for the reaction, ${\mathrm{H}}_2\mathrm{O}\rightleftharpoons {\mathrm{H}}^{+}+{\mathrm{OH}}^{-}<mspace\; width="1em"></mspace>\mathrm{at}<mspace\; width="1em"></mspace>25$$°\mathrm{C}$ is :

(1) 100kJ

(2) -90kJ

(3) 90kJ

(4)-100 kJ

The incorrect expression among the following is: 

1. In isothermal process, 

        ${\mathrm{W}}_{\mathrm{reversible}}=-\mathrm{nRT}<mspace\; width="1em"></mspace>\ln <mspace\; width="1em"></mspace>\frac{{\mathrm{V}}_{\mathrm{f}}}{{\mathrm{V}}_{\mathrm{i}}}$

2. $\ln <mspace\; width="1em"></mspace>\mathrm{K}=\frac{∆\mathrm{H}°-\mathrm{T}∆\mathrm{S}°}{\mathrm{RT}}$

3. $\mathrm{K}={\mathrm{e}}^{-∆\mathrm{G}°\mathrm{l}<mspace\; width="1em"></mspace>\mathrm{RT}}$

4. $\frac{∆{\mathrm{G}}_{\mathrm{system}}}{∆{\mathrm{S}}_{\mathrm{total}<mspace\; width="1em"></mspace>}}=-\mathrm{T}$

Temperature and heat are :

1.  Extensive properties

2.  Intensive properties

3.  Intensive and extensive properties respectively

4.  Extensive and intensive properties respectively

For a carnot engine, the source is at 500 K and the sink at 300 K. What is efficiency of this engine

(1) 0.2

(2) 0.4

(3) 0.6

(4) 0.3

When a liquid boils, there is [JIPMER 2002]

(1) An increase in entropy

(2) A decrease in entropy

(3) An increase in heat of vaporization

(4) An increase in free energy