What is the ∆H of the reaction?CH2Cl2 (g) →C

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 Multiple Choice QuestionsMultiple Choice Questions

591.

The correction factor ‘a’ to the ideal gas equation corresponds to

  • Density of the gas molecules

  • Volume of the gas molecules

  • Forces of attraction between the gas molecules

  • Electric field present between the gas molecules


592.

The energy released when 6 moles of octane is burnt in air will be [Given, ΔHf 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


593.

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


594.

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

  • NH3, PH3, AsH3

  • AsH3, PH3 NH3

  • NH3, AsH3, PH3

  • PH3, AsH3, NH3


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595.

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

  • T = 0

  • p = 0

  • q = 0 

  • W = 0


596.

32 O2(g) O3(g); Kp for this reaction is 2.47 x 10-29. At 298 K, rG° for conversion of oxygen to ozone will be

  • 100 kJ mol-1

  • 150 kJ mol-1

  • 163 kJ mol-1

  • 2303 kJ mol-1


597.

Graphite is a

  • molecular solid

  • covalent solid

  • ionic solid

  • metallic solid


598.

For the reaction,

H2O(l)  H2O(g)

at 373 K and 1 atm pressure

  • H = 0

  • E = 0

  • H = TS

  • H = E


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599.

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

  • qrev

  • qrev - Wrev

  • qrevWrev

  • qrev + Wrev


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600.

What is the H of the reaction?

CH2Cl2 (g) 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


A.

1482 kJ

In the reaction, two moles of C-H bonds and two moles of C-Cl bonds are broken. Hence, energy absorbed is

 = 2 x 416 + 2 x 325

 = 1482kJ


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