Q 2977756686.     Addition of excess aqueous ammonia to a pink coloured aqueous solution of `MCl_2 * 6H_2O(X)` and `NH_4Cl` 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(s) is(are) correct?

JEE 2017 Advanced Paper 1

(This question may have multiple correct answers)

A The hybridization of the central metal ion in `Y` is `d^2sp^3`
B When `X` and `Z` are in equilibrium at `"0°C"`, the colour of the solution is pink
C `"Z"` is a tetrahedral complex
D Addition of silver nitrate to Y gives only two equivalents of silver chloride

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