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Solution


Q.

An octahedral complex with the formula CoCl3·nNH3 upon reaction with excess of AgNO3 solution gives 2 moles of AgCl. Consider the oxidation state of Co in the complex is ‘x’. The value of “x + n” is ____.                              [2024]
1 8  
2 3  
3 5  
4 6  

Ans.

(1)

Since the complex is octahedral, its coordination number is 6 and as it gives 2 mol AgCl with excess of AgNO3, 2Cl- are outside coordination sphere. So the complex is [Co(NH3)5Cl]Cl2.

Oxidation number of Co(x)=+3, n=5, x+n=8