The bond energies of $\mathrm{C}\equiv \mathrm{C}$, C-H, H-H, and C=C are 198, 98, 103 and145 kcal respectively.

The enthalpy change of the reaction $\mathrm{HC}\equiv \mathrm{CH}+{\mathrm{H}}_2\to {\mathrm{C}}_2{\mathrm{H}}_4$ would be-

1. 48 kcal

2. 96 kcal

3. -40 kcal

4. -152 kcal

The molar entropy of the vapourization of acetic acid is\(14.4~ \mathrm{cal}~ \mathrm{K}^{-1} \mathrm{~mol}^{-1}\) at its boiling point ${118}^{\circ }C$. The latent heat of vapourization of acetic acid is-

An ideal gas absorbs 2000 cal of heat from a heat reservoir and does mechanical work equivalent to 4200 J. The change in internal energy of the gas is-

1. 3000 cal

2. 2000 cal

3. 1500 cal

4. 1000 cal

Which of the following thermodynamic quantities is an outcome of the second law of thermodynamics?

1. Work

2. Enthalpy

3. Internal energy

4. Entropy

The enthalpy of formation of CO₂(g), H₂O(l) and propene (g) are -393.5, -285.8, and 20.42 kJ mol^-1 respectively. The enthalpy change for the combustion of cyclopropane at 298 K will be:

(The enthalpy of isomerization of cyclopropane to propene is -33.0 kJ mol^-1. )
1. -1021.32 kJ mol^-1
2. -2091.32 kJ mol^-1
3. -5021.32 kJ mol^-1
4. -3141.32 kJ mol^-1

Which among the following state functions is an extensive property of the system?

Which, among the following, is not a state function?

1. Internal energy

2. Free energy

3. Work

4. Enthalpy

Which of the following is correct for isothermal expansion of an ideal gas -

1. W_rev = W_irr

2. W_rev + W_irr = 0

3. W_rev > W_irr

4. q_rev = q_irr

When 1 g H₂ gas at S.T.P is expanded to twice its initial volume, then the work done is:

1. 22.4 L atm
2. 5.6 L atm
3. 11.2 L atm
4. 44.8 L atm

The lattice energy of NaCl is 780 kJ mol^-1. The enthalpy of hydration of Na⁺(g) and Cl^-(g) ions are -406 kJ mol^-1 and -364 kJ mol^-1. The enthalpy of the solution of NaCl(s) is-

1. 23 kJ mol^-1

2. 10 kJ mol^-1

3. -10 kJ mol^-1

4. -82 kJ mol^-1