Important Questions of Thermodynamics Chemistry | Zigya

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161.

Which of the following relationships is correct?

  • k=TS°-H°RT

  • k=H°-TS°RT

  • ln k=H°-TS°RT

  • ln k=TS°-H°RT


162.

Which of the following represents the first law of thermodynamics?

  • U = q + W

  • U = p . V

  • U = H + P.V

  • H = q + W


163.

Heat of neutralization of HCl and NaOH is

  • -13.7 kcal

  • -13.7 J

  • -13.7 kJ

  • None of these


164.

Which is true for a cyclic process?

  • ΔE= 0

  • ΔE= q- W

  • q =W

  • All of these


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165.

When solid melts, there will be

  • a decrease in enthalphy

  • a decrease in free energy

  • a decrease in entropy

  • all the above factors remain constant


166.

To convert 94 g of ice at 0°C into 94g of vapour at 100° C, the quantity of coal (90% carbon) required is : (ΔHc of carbon = -94 k cal mol-1);latent heat of fusion = + 80 cal per gm; latent heat ofvaporisation=+ 540 cal per gm; specificheat of water = 1 cal per gm per °C).

  • 94g

  • 80g

  • 9.4g

  • 9.6 g


167.

When 1 M H2SO4 is completely neutralized by NaOH, the heat liberated is 114.64 kJ. What is the enthalpy of neutralization?

  • + 114.64 kJ

  • -114.64 kJ

  • -57.32 kJ

  • + 57.32 kJ


168.

What is the free energy change G when 10 moles of water at 100°C and 1 atm pressure is converted into steam at 100° C and 1 atm pressure?

  • 540 cal

  • -9800 cal

  • 9800 cal

  • 0 cal


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169.

In which of the following E = H?

  • N2O4 (g)  2NO2 (g)

  • 2SO2 (g) + O2 (g)  2SO3 (g)

  • H2 (g) + I2 (g)  2HI (g)

  • H2 (g) + 12 O2 (g) H2O (l)


170.

Match List I with List II and select the correct answer using the codes.
List I  List II
A. Spontaneous process 1 Δh < 0
B. Exothermic process 2. Heat of reaction
C. Enthalpy at constant pressure 3. ΔG < 0
D. Cyclic process 4. ΔU= 0,  ΔH = 0

  • A   B   C   D

    4   2   1    3

  • A   B   C   D

    3   1    2   4

  • A   B   C   D

    1   3    4   2

  • A   B   C   D

    1   2    3   4


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