JEE Main202226 Jul 2022Morning ShiftChemistryChemical EquilibriumActual
At 298 K , the equilibrium constant is 2 × 10 15 for the reaction: Cu s + 2 Ag + aq ⇌ Cu 2 + aq + 2 Ag s The equilibrium constant for the reaction 1 2 Cu 2 + aq + Ag s ⇌ 1 2 Cu s + Ag + aq is x × 10 - 8 . The value of x is ______. (Round off the answer to the nearest integer)
Correct answer
0
Step-by-step solution
Cu s + 2 Ag + aq ⇌ Cu 2 + aq + 2 Ag s ;   K eq = 2 × 10 15 1 2 Cu 2 + aq + Ag s ⇌ 1 2 Cu s + Ag + aq The equilibrium reaction is reversed and multiplied with 1 2 , Hence, K eq ' = 1 K eq = 1 2 × 10 15 = x × 10 - 8 ⇒ 1 20 × 1 10 7 = x × 10 - 8 ⇒ 1 20 × 10 - 7 = x × 10 - 8 10 20 = x ⇒ x = 10 2 = 5 = 2 . 236 ≃ 2 . 24