Cobalt chloride when dissolved in water forms pink colored complex X which has octahedral geometry. This solution on treating with conc. HCl forms deep blue complex Y which has Z geometry. X, Y and Z,

Question

Cobalt chloride when dissolved in water forms pink colored complex X which has octahedral geometry. This solution on treating with conc. HCl forms deep blue complex Y which has Z geometry. X, Y and Z, respectively, are:

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Strategy:
 Trace the reaction of cobalt chloride from its hydrated form to its complexed state in conc.  to find the geometry and identity of X, Y, and Z.

Step 1: Identify compound X
Dissolving  in water yields the completely hydrated pink complex  which has an octahedral geometry. (X)

Step 2: Identify compound Y and Geometry Z
Adding concentrated  forces the high concentration of  to displace the water molecules, forming the deep blue tetrachloridocobaltate(II) ion, . (Y)
A complex with coord

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