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On treatment of 100 mL of 0.1 M solution of CoCl 3 .6H 2 O with excess AgNO 3 ; 1.2 × 10 22 ions are precipitated. The complex is :

1. [Co(H 2 O) 6 ]Cl 3
2. [Co(H 2 O) 5 Cl]Cl 2 .H 2 O
3. [Co(H 2 O) 4 Cl 2 ]Cl.2H 2 O
4. [Co(H 2 O) 3 Cl 3 ].3H 2 O

Correct answer: [Co(H 2 O) 5 Cl]Cl 2 .H 2 O

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