The bond dissociation energy of CH₄ and C₂H₆ are 360 and 620 Kcal/mole respectively. Determine the bond enthalpy of a single carbon-carbon (C–C) bond:

1. 260 Kcal/mole

2. 180 Kcal/mole

3. 130 Kcal/mole

4. 80 Kcal/mole

Which of the following statements correctly describes the change in entropy of the universe during all natural processes?

1. A decrease in entropy of the universe
2. An increase in entropy of the universe
3. No change in entropy of the universe
4. Sometimes an increase and sometimes a decrease in entropy of the universe

For the reaction, $2{\mathrm{N}}_2\left(\mathrm{g}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\to 2{\mathrm{N}}_2\mathrm{O}\left(\mathrm{g}\right)$, at 298K $∆\mathrm{H}$ is 164 kJ mol^-1. The $∆\mathrm{E}$ of the reaction is :
1. \(166.5 \mathrm{~kJ} \mathrm{~mol}^{-1} \)
2. \(141.5 \mathrm{~kJ} \mathrm{~mol}^{-1} \)
3. \(104.0 \mathrm{~kJ} \mathrm{~mol}^{-1} \)
4. \(-169 \mathrm{~kJ} \mathrm{~mol}^{-1}\)

The bond energies of C=C and C-C at 298 K are 590 and 331 kJ mol^-1 respectively. The enthalpy of polymerization per mole of ethylene is

1. -70 kJ

2. -72 kJ

3. 72 kJ

4. -68 kJ

Which of the following statements is correct with regard to $∆$G of a cell reaction and EMF of the cell (E) in which the reaction occurs ?

1.  Both $∆$G and E are extensive properties

2.  $∆$G is an intensive property but E is an extensive property

$3.\; ∆$G is an extensive property and E is an intensive property

4.  Both $∆$G and E are intensive properties.

$$\begin{gathered} {\mathrm{C}}_2{\mathrm{H}}_6\left(\mathrm{g}\right)+3.5{\mathrm{O}}_2\left(\mathrm{g}\right)\to 2{\mathrm{CO}}_2\left(\mathrm{g}\right)+3{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right) \\ ∆{\mathrm{S}}_{\mathrm{vap}}\left({\mathrm{H}}_2\mathrm{O},<mspace\; width="1em"></mspace>\mathrm{l}\right)={\mathrm{x}}_1<mspace\; width="1em"></mspace>\mathrm{cal}<mspace\; width="1em"></mspace>{\mathrm{K}}^{-1}\left(\mathrm{b}.\mathrm{p}.<mspace\; width="1em"></mspace>+{\mathrm{T}}_1\right) \\ ∆{\mathrm{H}}_{\mathrm{f}}\left({\mathrm{H}}_2\mathrm{O},<mspace\; width="1em"></mspace>\mathrm{l}\right)={\mathrm{x}}_2;<mspace\; width="1em"></mspace>∆{\mathrm{H}}_{\mathrm{f}}\left({\mathrm{CO}}_2\right)={\mathrm{x}}_3,<mspace\; width="1em"></mspace>∆{\mathrm{H}}_{\mathrm{f}}\left({\mathrm{C}}_2{\mathrm{H}}_6\right)={\mathrm{x}}_4 \\ \mathrm{Hence}<mspace\; width="1em"></mspace>∆\mathrm{H}<mspace\; width="1em"></mspace>\mathrm{for}<mspace\; width="1em"></mspace>\mathrm{the}<mspace\; width="1em"></mspace>\mathrm{reaction}<mspace\; width="1em"></mspace>\mathrm{is}: \end{gathered}$$

1. $2x_3+3x_2-x_4$

2. $2x_3+3x_2-x_4+3x_1{T}_1$

3. $2x_3+3x_2-x_4-3x_1{T}_1$

4. $x_1{T}_1+x_2+x_3-x_4$

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-

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

From the following data of $∆H$, of the following reactions,

$C\left(s\right)+\frac{1}{2}{O}_2\to CO\left(g\right)<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>;∆H=-110<mspace\; width="1em"></mspace>kJ$
$C\left(s\right)+H_{2}O\to CO\left(g\right)+H_2\left(g\right)<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>;∆H=132<mspace\; width="1em"></mspace>kJ$

What is the mole composition of the mixture of steam and oxygen on being passed over coke at 1273 K, keeping temperature constant.

1. 0.5 : 1

2. 0.6 : 1

3. 0.8 : 1

4. 1 : 1