Addition of excess aqueous ammonia to a pink coloured aqueous solution of `MCl_(2). 6H_(2)O(X) and NH_(4)Cl` gives an octahedral complex Y in the presence of air. In aqueous solution, complex Y behaves as 1:3 electrolyte. The reaction of X with excess HCl at room temperature results in the formation of a blue coloured complex Z. The calculated spin only magnetic moment of X and Z is 3.87 B.M., whereas it is zero for complex Y.
Among the following options, which statement is incorrect ?

Options

A. The hybridization of the central metal ion in Y is `d^(2)sp^(3)`
B. Additoin of silver nitrate to Y gives only two equivalents of silver chloride
C. When X and Z are in equilibrium of `0^(@)C` ,the coloure of the solution in pink
D. Z is a tetrahedral complex

Answer

ACD

Explanation

`[Co(H_(2)O)_(6)]Cl_(2)underset(NH_(4)Cl+"Air")overset(NH_(3)(aq))(rarr)[Co(NH_(3))_(6)]Cl_(3)`

Blue solution ( Tetrahedral , `sp^(3))`
X `&` Z in equilibrium at `0^(@)C implies ` Then equilibrium is shifted towards X, makinig colour of solution pink