The enthalpy of the formation of CO₂ and H₂O are -395 kJ and -285 kJ respectively and the enthalpy of combustion of acetic acid is 869 kJ. The enthalpy of formation of acetic acid is

• 340 kJ

• 420 kJ

• 491 kJ

• 235 kJ

12.

Considering entropy(s) as a thermodynamic parameter, the criterion for the spontaneity of any process, the change in entropy is

• $∆{\mathrm{S}}_{\mathrm{system}} >0 \mathrm{only}$

• $∆{\mathrm{S}}_{\mathrm{surrounding}} > 0$

• $\left(∆{\mathrm{S}}_{\mathrm{system}} + ∆{\mathrm{S}}_{\mathrm{surrounding}}\right) > 0$

• $(∆{\mathrm{S}}_{\mathrm{system}} - ∆{\mathrm{S}}_{\mathrm{surrounding}}) > 0$

At low pressure and high temperature, the van der Waal's equation is finally reduced (simplified) to

• $\left(\mathrm{p} + \frac{\mathrm{a}}{{\mathrm{V}}_{\mathrm{m}}^2}\right)({\mathrm{V}}_{\mathrm{m}} - \mathrm{b}) = \mathrm{RT}$

• $\mathrm{p}({\mathrm{V}}_{\mathrm{m}} - \mathrm{b}) = \mathrm{RT}$

• $\left(\mathrm{p} + \frac{\mathrm{a}}{{\mathrm{V}}_{\mathrm{m}}^2}\right){\mathrm{V}}_{\mathrm{m}} = \mathrm{RT}$

• pV_m = RT

Which of the following electron has minimum energy?

• n = 4; l = 0; m= 0; s = +$\frac{1}{2}$

• n= 4; l= 1; m = ±1; s = +$\frac{1}{2}$

• n = 5; l = 0; m = 0; s = +$\frac{1}{2}$

• n = 3; l = 2; m = -2; s = +$\frac{1}{2}$

The increasing order of the first ionisation enthalpies of the elements B, P, S and F is 

• B < S < P < F

• F < S < P < B

• P < S < B < F

• B < P < S < F

Rank the following in decreasing order of basic strength

(i) CH₃-CH₂-C≡C^-

(ii) CH₃-CH₂-S^-

(iii) CH₃-CH₂-CO${}_2^{-}$

(iv) CH₃-CH₂-O^-

• (iv) > (i) > (ii) > (iii)

• (i) > (iv) > (ii) > (iii)

• (i) > (iv) > (iii) > (ii)

• (ii) > (i) > (iv) > (iii)

Which of the following molecules is optically active?

• (i) and (iii)

• (ii) and (iii)

• (i), (ii) and (iii)

• (i) and (ii)

Provide the systematic name of the compound shown

• 4- butyl - 2-ethyl - 1- methylcycloheptane

• 1- butyl - 4-ethyl - 3- methylcycloheptane

• 2- butyl - 4-ethyl - 1- methylcycloheptane

• 4- butyl - 1-ethyl - 2- methylcycloheptane

Which one of the following compounds will have the highest dipole moment?

Total number of stereoisomers of the following compounds are respectively

• 8, 0

• 6, 6

• 8, 8

• 4, 6