`CoCl_(4)^(2-)(aq)` is blue in color while `[Co(H_(2)O)_(6)]^(2+)` is pink. The color of reaction mixture
`Co(H_(2)O)_(6)^(2+)(aq)+4Cl^(-)(aq)hArr CoCl_(4)^(2-)(aq)+6H_(2)O(l)`
is blue at room temprature while it is pink when cooled heance

Options

A. reaction is exothermic
B. reaction is endothermic
C. equlibrium will shift in forward direction on adding water to reaction mixture
D. equilibrium will not shift on adding water to equilibrium mixture.

Answer

2

Explanation

As cooling pink colour intensifies so reaction is shifting in backward direction, so reaction must be endothermic.
On adding water, the equilibrium will shift direction, as concentration of al species will decrease `K_(C)=((n_(CaCl_(4)^(2-)))/(n_(Co(H_(2)O)_(4)^(2+))xx(n_(Cl^(-)))^(4)))("Volume")^(4)`