See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

For ideal gas mole % = volume % 2 2 2 initial moles a 0 at eqm a(1 ) 2a N O (g) 2NO (g)     As per given, original volume   75 Volume at equilibrium at constant T and P V n 100     a = 0.75 × a(1 + )   = 0.33