1.

An excess of AgNO_(3) is added to 100 mL of 0.01 M solution of dichlorotetraaquachromium (III) chloride. The number of moles of AgCl precipitated would be :

Answer»

0.001
0.002
0.003
0.01

Solution :The complex is `[Co(H_(2)O)_(4)Cl_(2)]Cl`. It ionizes as `underset("1 mole")([Cr(H_(2)O)_(4)Cl_(2)])Cl IFF [Cr(H_(2)O)_(4)Cl_(2)]^(+)+underset("1 mole")(Cl^(-))`
Thus, 1 mole of the complex produces 1 mole of `Cl^(-)` ions and hence will PRECIPITATE out 1 mole of AgCl.
100 ML of 0.01 M complex solution contains moles of the complex `= (0.01)/(1000)xx100=0.001` mole and will precipitate out 0.001 mole of AgCl.


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