Question

Assertion : Aqueous solution of CoCl₂ is pink in colour. It tums blue in presence of cone, HCl.

Reason: It is due to the formation of [CoCl₄]^2-.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false

Answer 1

Correct option  (a) Both A and R are true and R is the correct explanation of A

Explanation:

According to Le Chatelier's principle, on adding cone. HCl, the equilibrium shifts in forward direction giving blue colour, And when this blue colour is diluted, equilibrium shifts in backward direction leading to pink colour.