Question

 Which statement is are correct? 

(A) Final temperature in reversible adiabatic expansion is lesser than in irreversible adiabatic expansion 

(B) When heat is supplied to an ideal gas in an isothermal process, kinetic energy of gas will increase 

(C) When an ideal gas is subjected to adiabatic expansion it gets cooled. 

(D) Entropy increases in atomisation of dihydrogen

Answer 1

Correct option  (A, C, D)  

Explanation:

(i) In adiabatic explained w < 0, 

Q = 0 

(ii) K.E = 3/2 nRT dependent on temperature if T is constant then KE is constant for adiabatic expansion of gas

nC_V ∆T = w < 0

H₂?→1/2 H

∆S > 0, STV as no. of molecules hence no. of molecules.