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Question

Mixture X=0.02 mol 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 AgNO3Y
1 litre of mixture X + excess BaCl2Z
Number 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
1.0 L of mixture X contain 0.01 mole of each [Co(NH3)5SO4]Br and [Co(NH3)5Br]SO4
Also, with AgNO3, only [Co(NH3)5SO4]Br reacts to give AgBr precipitate as:
[Co(NH3)5SO4]Br0.01 mol+AgNO3excess[Co(NH3)5SO4]NO3+AgBr0.01 mol
Similarly, in the second reaction BaSO4 will be precipitated
[Co(NH3)5Br]SO40.01 mol+BaCl2excess[Co(NH3)5SO4]Cl2+BaSO40.01 mol
Option (a) is correct.

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