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

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 Multiple Choice QuestionsMultiple Choice Questions

291.

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


292.

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

  • NH3, PH3, AsH3

  • AsH3, PH3 NH3

  • NH3, AsH3, PH3

  • PH3, AsH3, NH3


293.

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

  • T = 0

  • p = 0

  • q = 0 

  • W = 0


294.

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


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295.

Graphite is a

  • molecular solid

  • covalent solid

  • ionic solid

  • metallic solid


296.

For the reaction,

H2O(l)  H2O(g)

at 373 K and 1 atm pressure

  • H = 0

  • E = 0

  • H = TS

  • H = E


297.

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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298.

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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299.

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) + 12O2 (g)  CO2(g)

  • -504

  • -142.5

  • -283

  • 504


300.

The change in entropy for the fusion of 1 mole of ice is [mp of ice = 273 K, molar enthalpy of fusion for ice= 6.0 kJ mol-1]

  • 11.73 JK-1 mol-1

  • 18.84 JK-1 mol-1

  • 21.97 JK-1 mol-1

  • 24.47 JK-1 mol-1


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