Calculate Kc for the reversible process given below if Kp = 167 a

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 Multiple Choice QuestionsMultiple Choice Questions

691.

The enthalpy of vaporisation of a certain liquid at its boiling point of 35°C is 24.64 kJ mol-1. The value of change in entropy for the process is

  • 704 JK-1mol-1

  • 80 JK-1mol-1

  • 24.64 JK-1mol-1

  • 7.04 JK-1mol-1


692.

Given that,

    C + O2 → CO2H = -x kJ

2CO + O2 → 2CO2 ;H = -y kJ

The heat of formation of carbon monoxide will be

  • y - 2x2

  • y + 2x

  • 2x - y

  • 2x - y2


693.

Which of the following is correct?

  • Evaporation of water causes an increase in disorder of the system

  • Melting of ice causes a decrease in the randomness of the system

  • Condensation of steam causes an increase in disorder of the system

  • There is practically no change in the randomness of the system when water is evaporated


694.

The amount of the heat released when 20 mL 0.5 M NaOH is mixed with 100 ml 0.1 M HCl is x kJ. The heat of neutralisation is:

  • - 100 x kJ/mol

  • - 50 x kJ/mol

  • + 100 x kJ/mol

  • + 50 x kJ/mol


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695.

For a spontaneous process, the correct statement(s) is (are)

  • (Gsystem)T, p > 0

  • (Ssystem) + (Ssurroundings) > 0

  • (Gsystem)T, p < 0

  • (Usystem)t, v > 0


696.

The second law of thermodynamic says that in a cyclic process

  • work cannot be converted into heat

  • heat cannot be converted into work

  • work cannot be completely converted into heat

  • heat cannot be completely converted into work


697.

Equal volumes of molar hydrochloric acid 'and sulphuric acid are neutralized by dilute NaOH solution and x kcal and y kcal of heat are liberated respectively. Which of the following is true ?

  • x = y

  • x =y/2

  • x = 2y

  • none of these


698.

Which of the following thermodynamic relation is correct ?

  • dG = Vdp- SdT

  • dE = pdV + TdS

  • dH = -Vdp + Tds

  • dG = Vdp + SdT


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699.

Calculate Kc for the reversible process given below if Kp = 167 and T = 800°C

CaCO3 (s)  CaO (s) + CO2 (g)

  • 1.95

  • 1.85

  • 1.89

  • 1.60


C.

1.89

Kp = Kc(RT)ng

For Eq. CaCO3 (s)  CaO (s) + CO2 (g), ng = 1

KcKp(RT)ng = 167(0.0821 × 1073)1 = 1.89


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700.

For which reaction change of entropy will be positive?

  • H2(g) + I2(g)  2HI (g)

  • HCl (g) + NH3 (g)  NH4Cl (s)

  • NH4NO3 (s)  N2O (g) + 2H2O (g)

  • MgO(s) + H2(g)  Mg(s) + H2O(l)


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