Q.

Werner passed air through a solution of CoCl2 in an excess of ammonia and the resulting solution is crystallized to get five different compounds. one of the compound gave the following tests.

1.Reacts with Conc.H2SO4 

2.Reacts with 1 mole of AgNO3 solution

3.It's conductivity belongs to 1:2 electrolyte

Identify the correct molecular formula of the complex

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a

CoCl3.5NH3

b

CoCl3.5NH3.H2O

c

CoCl3.6NH3

d

CoCl3.4NH3

answer is A.

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