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Question

On treatment of 100mL of 0.1M solution of CoCl3.6H2O with excess AgNO3;1.2×1022 ions are precipitated. The complex is :

A
[Co(H2O)3Cl3].2H2O
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B
[Co(H2O)6]Cl3
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C
[Co(H2O)5Cl]Cl2.H2O
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D
[Co(H2O)4Cl]Cl2.H2O
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Solution

The correct option is C [Co(H2O)5Cl]Cl2.H2O
Avogadro's number is 6.023×1023
1.2×1022 ions corresponds to 1.2×10226.023×1023=0.02 moles.
100 mL of 0.1M solution of CoCl3.6H2O corresponds to 100mL1000mL/L×0.1M=0.01moles.
0.01 moles of CoCl3.6H2O reacts with excess AgNO3 to form 0.02 moles of AgCl precipitate, which means 0.01 moles of Ag+ and 0.01 moles of Cl ions.
Thus, from one molecule of CoCl3.6H2O, one chlorine atom is displaced. Hence, the complex is
[Co(H2O)5Cl]Cl2.H2O as number of chloride ion outside co-ordination sphere should be one.
Hence, the option (C) is the correct answer.

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