An aqueous pink solution of cobalt(II) chloride changes to deep blue on the addition of excess of HCl. This is because:
| a. | \([Co(H_2O)_6]^{2+}\) is transformed into \([CoCl_6]^{4-}\) |
| b. | \([Co(H_2O)_6]^{2+}\) is transformed into \([CoCl_4]^{2-}\) |
| c. | Tetrahedral complexes have smaller crystal field splitting than octahedral complexes |
| d. | Tetrahedral complexes have larger crystal field splitting than octahedral complexes |
Choose the correct option:
1. a and b
2. b and c
3. c and d
4. a and c
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