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CBSE

Subject

Chemistry

NEET Chemistry : Thermodynamics

Multiple Choice Questions

31.

The energy released when 6 moles of octane is burnt in air will be [Given, ΔH_f for CO₂ (g). H₂O(g) and C₈H₁₈ (l), respectively are -490, -240 and +160J/mol]

-37.4 kJ
-20 kJ
-6.2 kJ
-35.5 kJ

32.

If for a given substance, melting point is T_B and freezing point is T_A then correct variation of entropy by graph between entropy change and temperature is

33.

Which of the following is the increasing order of enthalpy of vaporization?

NH₃, PH₃, AsH₃
AsH₃, PH₃ NH₃
NH₃, AsH₃, PH₃
PH₃, AsH₃, NH₃

34.

For the process to occur under adiabatic conditions, the correct condition is

$∆$ T = 0
$∆$ p = 0
q = 0
W = 0

35.

$\frac{3}{2}$ O₂(g) $\to$ O₃(g); K_p for this reaction is 2.47 x 10^-29. At 298 K, $∆_{r} G °$ for conversion of oxygen to ozone will be

100 kJ mol^-1
150 kJ mol^-1
163 kJ mol^-1
2303 kJ mol^-1

36.

Graphite is a

molecular solid
covalent solid
ionic solid
metallic solid

37.

For the reaction,

H₂O(l) $⇌$ H₂O(g)

at 373 K and 1 atm pressure

$∆$ H = 0
$∆$ E = 0
$∆$ H = T $∆ S$
$∆$ H = $∆$ E

38.

According to the first law of thermodynamics which of the following quantities represents the change in a state function?

q_rev
q_rev - W_rev
$\frac{q_{rev}}{W_{rev}}$
q_rev+ W_rev

39.

What is the $∆$ H of the reaction?

CH₂Cl₂ (g) $\to$ C (g) + 2H (g) + 2Cl (g)

The average bond energies of C-Cl bond and C-H bond are 416 kJ and 325 kJ mol^-1 respectively.

1482 kJ
1482 J
1492 kJ
1492 J

40.

The heat of formation of CO(g) and CO₂ (g)are $∆$ H = -110 and $∆$ H = - 393 kJ mol^-1 respectively. What is the heat of reaction ( $∆$ H) (in kJ mol^-1) for the following reaction?

CO (g) + $\frac{1}{2} O^{2}$ (g) $\to$ CO₂(g)

-504
-142.5
-283
504

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