An aqueous solution of CoCl₂ on addition of excess of concentration HCl

An aqueous solution of CoCl₂ on addition of excess of concentrated HCl turns blue due to formation of

Options

(a) [Co(H₂O)₄Cl₂]
(b) [Co(H₂O)₂Cl₄]²⁻
(c) [CoCl₄]²⁻
(d) [Co(H₂O)₂Cl₂]

Correct Answer:

[CoCl₄]²⁻

Explanation:

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