MEDIUM

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IMPORTANT

Earn 100

Select the correct set of statement/s:

$I$ . Work done by the surrounding, in case of an infinite stage expansion, is more than a single stage expansion.

$II$ . Irreversible work is always greater than reversible work. (with sign)

$III$ . On an ideal gas, in case of single stage expansion and compression, systems as well as surroundings are restored back to their original states.

$IV .$ If gas in thermodynamic equilibrium is taken from state $A$ to state $B$ , by four successive single stage expansions, we can plot $4$ points on the $P - V$ indicator diagram.

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Important Questions on Thermodynamics & Thermochemistry

HARD

KVPY Aptitude Test - Stream SA

IMPORTANT

Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 5 - Thermodynamics & Thermochemistry>EXERCISE>Q 13

One mole of an ideal gas

(C_{v, m} = \frac{5}{2} R)

300 K

and

5 atm

is expanded adiabatically to a final pressure of

2 atm

, against a constant pressure of

2 atm

. Final temperature of the gas is:

HARD

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IMPORTANT

Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 5 - Thermodynamics & Thermochemistry>EXERCISE>Q 14

The work done in adiabatic compression of

2

moles of an ideal monatomic gas by a constant external pressure of

2 atm

starting from initial pressure of

1 atm

and initial temperature of

300 K (R = 2 cal / mol - degree)

EASY

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IMPORTANT

Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 5 - Thermodynamics & Thermochemistry>EXERCISE>Q 15

One mole of non-ideal gas undergoes a change of state

(1.0 atm, 3.0 L, 200 K)

(4.0 atm, 5.0 L, 250 K)

, with a change in internal energy

(ΔU) = 40 L - atm

. The change in enthalpy of the process in

L - atm

;

EASY

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IMPORTANT

Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 5 - Thermodynamics & Thermochemistry>EXERCISE>Q 16

0.5

mole each of two ideal gases,

A (C_{v, m} = \frac{5}{2} R)

and

B (C_{v, m} = 3 R)

, are taken in a container and expanded reversibly and adiabatically. During this process, the temperature of gaseous mixture decreased from

350 K

and

250 K

. Then for the process:

MEDIUM

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 5 - Thermodynamics & Thermochemistry>EXERCISE>Q 17

Predict which of the following reaction (s) has a positive entropy change?

$I .$ ${Ag}^{+} (aq) + {Cl}^{-} (aq) ⟶ AgCl (s)$

$II .$ ${NH}_{4} Cl (s) ⟶ {NH}_{3} (g) + HCl (g)$

$III$ . $2 {NH}_{3} (g) ⟶ N_{2} (g) + 3 H_{2} (g)$

HARD

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 5 - Thermodynamics & Thermochemistry>EXERCISE>Q 18

Which of the following reactions is associated with the most negative change in entropy?

MEDIUM

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 5 - Thermodynamics & Thermochemistry>EXERCISE>Q 19

When two moles of an ideal gas

(C_{p, m} = \frac{5}{2} R)

heated from

300 K

600 K

at constant pressure, the change in entropy of gas

(ΔS)

is:

MEDIUM

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IMPORTANT

Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 5 - Thermodynamics & Thermochemistry>EXERCISE>Q 20

When two moles of an ideal gas

(C_{p, m} = \frac{5}{2} R)

heated from

300 K

600 K

at constant pressure, calculate

{ΔS}_{gas}

, if the process is carried out at a constant volume:

Important Questions on Thermodynamics & Thermochemistry

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