The amount of heat evolved when 500 cm3 of 0.1 M HCl is mixed wit

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 Multiple Choice QuestionsMultiple Choice Questions

201.

For the reaction H2O (l)  H2O (g) at 373 K and 1 atm pressure

  • H = 0

  • E = 0

  • H = TS

  • H = E


202.

The enthalpy of formation of NH3 is - 46kJ mol-1. The enthalpy change for the reaction is-

2NH3 (g) → N2 (g) + 3H2 (g) 

  • +184 kJ

  • +23 kJ

  • +92 kJ

  • +46 kJ


203.

Enthalpy of vaporization of benzene is + 35.3 kJ mol-1at its boiling point, 80C. The entropy change in the transition of the vapour to liquid at its boiling point in [JK-1mol-1] is

  • -441

  • -100

  • +441

  • +100


204.

The amount of heat evolved when 500 cm3 of 0.1 M HCl is mixed with 200 cm3 of 0.2 M NaOH is

  • 2.292 kJ

  • 1.292 kJ

  • 0.292 kJ

  • 3.392 kJ


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205.

During the adsorption of krypton on activated charcoal at low temperature.

  • ΔH > 0 and ΔS < 0

  • ΔH < 0 and ΔS < 0

  • ΔH > 0 and ΔS > 0

  • ΔH < 0 and ΔS < 0


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206.

The amount of heat evolved when 500 cm3 of 0.1 M HCl is mixed with 200 cm3 of 0.2 M NaOH is

  • 2.292 kJ

  • 1.292 kJ

  • 22.9 kJ

  • 0.292 kJ


A.

2.292 kJ

No. of equivalents of NaOH reacting = 401000

1 eq = 57.3

401000 eq = 57.3 × 401000 = 2.292 kJ


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207.

The enthalpy of vaporization of benzene is +35.3 kJ/mol at its boiling point, 80°C. The entropy change in the transition of vapour to liquid at its boiling point is

  • -100

  • +100

  • +342

  • -342


208.

Based on the first law of thermodynamics, which one of the following is correct?

  • For an isothermal process, Q = + W

  • For an isochoric process, U = -Q

  • For an adiabatic process, U= -W

  • For a cyclic process, Q = -W


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209.

Based on the first law of thermodynamics, which one of the following is correct?

  • For an isochoric process = ΔE = - q

  • For an adiabatic process = ΔE =-w

  • For an isothermal process = q = + w

  • For a cyclic process q = - w


210.

For the reversible reaction, A (s) + B (g)  C (g) + D (g), G° = -350 kJ, which one of the following statements is true?

  • The reaction is thermodynamically non-feasible

  • The entropy change is negative

  • Equilibrium constant is greater than one

  • The reaction should be instantaneous


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