Chemical Thermodynamics (NEET Chemistry): Questions 35 - 39 of 50

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Question number: 35

» Chemical Thermodynamics » State Functions » Entropy

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.

-38.59 k J/mol

b.

3.859 k J/mol

c.

38.59 k J/mol

d.

- 3.859 k J/mol

Question number: 36

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

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 K

b.

spontaneous at all temperatures

c.

Not possible

d.

654 °C

Question number: 37

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

MCQ▾

Question

”All forms of energy can be converted into heat energy but heat cannot be converted into other forms of energy fully by any process “ is the statement of?

Choices

Choice (4) Response

a.

Thomson statement

b.

Boltzman statement.

c.

Kelvin –plank statement

d.

Calcius statement

Question number: 38

» Chemical Thermodynamics » First Law of Thermodynamics » Enthalpy

MCQ▾

Question

When a weak acid and a strong base are mixed in equal amounts, the heat evolved or change in enthalpy is?

Choices

Choice (4) Response

a.

1.37KCal

b.

<13.7KCal

c.

13.7KCal

d.

>13.7KCal

Question number: 39

» Chemical Thermodynamics » First Law of Thermodynamics » Hess's Law of Constant Heat Summation

MCQ▾

Question

Which of the following statement is correct about Hess law?

Choices

Choice (4) Response

a.

Heat of reaction depends on the sum of enthalpies of products-enthalpies of reactants

b.

Heat of reaction depends on the sum of enthalpies of products + enthalpies of reactants

c.

Heat of reaction depend on the time of process

d.

Heat of formation of compound is dependent of manner of its formation.

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