NEET (NTA)-National Eligibility cum Entrance Test (Medical) Chemistry: Questions 29 - 34 of 1258

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Question number: 29

» Chemical Thermodynamics » First Law of Thermodynamics » Work

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MCQ▾

Question

5 moles of an ideal gas at 27°C expands isothermally and reversibly from a volume of 6L to 60 L. The work done in k J is?

Choices

Choice (4) Response

a.

28.72

b.

-14.7

c.

-56.72

d.

-28.72

Question number: 30

» Chemical Thermodynamics » State Functions » Internal Energy

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Question

Which of the following unit represents largest amount of energy?

Choices

Choice (4) Response

a.

Erg

b.

Electron volt

c.

Joule

d.

Carrie

Question number: 31

» Chemical Thermodynamics » First Law of Thermodynamics » Enthalpies of Bond

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MCQ▾

Question

The bond energies of C = C and C-C at 298K are 590 and 331 KJ/mol respectively. The enthalpy of polymerization per mole of ethylene is?

Choices

Choice (4) Response

a.

-68 KJ

b.

72 KJ

c.

-70 KJ

d.

-72 KJ

Question number: 32

» Chemical Thermodynamics » State Functions » Entropy

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MCQ▾

Question

The enthalpy change, for the transition of liquid water to steam, ∆ H vapour is 40.8 KJ/mol at 373K. Calculate the entropy change for process?

Choices

Choice (4) Response

a.

b.

c.

d.

109.38 J/K m o l

Question number: 33

» Chemical Thermodynamics » Second Law of Thermodynamics » Standard Gibbs Energy Change

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MCQ▾

Question

When an ideal gas compressed adiabatically and reversibly, the final temperature is?

Choices

Choice (4) Response

a.

Depend on rate of compression.

b.

Lower than the initial temperature

c.

Higher than the initial temperature

d.

Same as the initial temperature

Question number: 34

» Chemical Thermodynamics » First Law of Thermodynamics » Enthalpies of Bond

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MCQ▾

Question

The bond dissociation energies of gaseous H 2, Cl 2, and HCL are 104,58 and 103 kcal/mol respectively. Calculate the enthalpy of formation of HCl (g)?

Choices

Choice (4) Response

a.

42 kcal/mol

b.

22 kcal/mol

c.

-22 klcal/mol

d.

-42kcal/mol