NEET (NTA)-National Eligibility cum Entrance Test (Medical) Chemistry: Questions 33 - 38 of 1259

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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

Question number: 35

» Chemical Thermodynamics » First Law of Thermodynamics » Enthalpy

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MCQ▾

Question

Thermodynamic state quantity which is a measure of randomness or disorder of molecules of the system?

Choices

Choice (4)Response

a.

Work

b.

Enthalpy

c.

Heat capacity

d.

Entropy

Question number: 36

» Chemical Thermodynamics » State Functions » Entropy

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MCQ▾

Question

Calculate the enthalpy of vaporization per mole of ethanol. Given ∆ S = 109.8J/Kmol and boiling point of ethanol is 78.5°C. ?

Choices

Choice (4)Response

a.

3.859 k J/mol

b.

38.59 k J/mol

c.

- 3.859 k J/mol

d.

-38.59 k J/mol

Question number: 37

» States of Matter » Solid State » Unit Cell and Lattices

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MCQ▾

Question

Which one of the following can be determined by using Born-Haber cycle?

Choices

Choice (4)Response

a.

Enthalpy

b.

Heat capacity

c.

Lattice energy

d.

Internal energy

Question number: 38

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

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MCQ▾

Question

For a reaction, ∆ H =+30 k J/mol and ∆ S =-34 J/Kmol, at what temperature the reaction will be spontaneous?

Choices

Choice (4)Response

a.

654 °C

b.

654 K

c.

spontaneous at all temperatures

d.

Not possible

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