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in Chemical thermodynamics by (64.7k points)

Statement-I: The heat absorbed during the isothermal expansion of an ideal gas against vacuum is zero 

Statement-II: The volume occupied by the molecules of an ideal gas is zero.

(A) Statement-I is true; statement-II is true; statement-II is the correct explanation of statement-I. 

(B) Statement-I is true; statement-II is true; statement-II is not the correct explanation of statement-I. 

(C) Statement-I is true; statement-II is false. 

(D) Statement-I is false; statement-II is true

1 Answer

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Best answer

Correct option (B) Statement-I is true; statement-II is true; statement-II is not the correct explanation of statement-I.

Explanation:

dq = dE + pextdV = 0

∆T = 0

∴ dE = 0; pext = 0

∴ pextdV = 0

Statement-II is true. According to kinetic theory of gases, volume occupied by molecules of ideal gas is zero.

However, statement-II is not the correct explanation of statement-I.

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