an excess of agno3 is added to 100 ml of a 0.01 M solution of [cr(h2o)4cl2]cl.the number of agcl precipated would be:

is this question based on common ion effect

No. of  moles of complex = M (moles/litre) ×V (litre) =0.01 × (100/1000) =0.001

[Cr(H2O)4Cl2]Cl has one ionizable Cl−
10−3 moles of the complex precipitates the same amount of AgCl

That is it would precipitate 0.001 moles of AgCl  

No this is not based on concept of common ion effect  it is simple displacement reaction.

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