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Question

Mixture [X]=0.02 mole of [Co(NH3)5SO4]Br and 0.02 mol of [Co(NH3)5Br]SO4 was prepared in 2 litre of solution.
1 litre of mixture [X] + excess AgNO3 [Y]
1 litre of mixture [X] + excess BaCl2 [Z]
No. of moles of [Y] and [Z] are :

A
0.01,0.01
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B
0.02,0.01
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C
0.01,0.02
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D
0.02,0.02
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Solution

The correct option is A 0.01,0.01
Total volume of the solution is 2 L,

Mixture X contains 0.02 moles of [Co(NH3)5SO4]Br

Therefore Molarity of [Co(NH3)5SO4]Br,

No. of moles of soluteVolume of solution in Litres=0.022=0.01M

Mixture of X also contains 0.02 moles of [Co(NH3)5Br]SO4,

Therefore, Molarity of [Co(NH3)5Br]SO4= No. of moles of soluteVolume of solution in Litres=0.022=0.01M

Now, according to the reaction,

[Co(NH3)5SO4]Br(0.01M)+AgNO3[Co(NH3)5SO4]NO3(Soluble)+AgBr[Y]ppt

According to Avogadro law, the molarity of AgBr will also be 0.01, since molarity is moles per litre. Therefore, the number of moles of AgBr will also be 0.01.

Similarly in the second reaction, BaSO4 (Z) will be precipitated and [Co(NH3)5Br]Cl2 will be formed which is soluble. Therefore, no. of moles of BaSO4 = 0.01

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