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 pressure 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 compelx 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(s) is(are) correct ?

Options

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

Answer

A, C, D