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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 2L of solution.


1L of mixture X + excess AgNO3Y
1L of mixture X + excess BaCl2Z

Number of moles of Y and Z are :

A
0.03,0.02
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B
0.01,0.02
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C
0.01,0.01
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D
0.02,0.02
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Solution

The correct option is C 0.01,0.01
1.0 L of mixture X contain 0.01 mole of each [(Co(NH3)5SO4]Br an [Co(NH3)5Br]SO4.

Also, with AgNO3, only [(Co(NH3)5SO4)]Br reacts to give AgBr precipitate as

[Co(NH3)5SO4]Br+AgNO3[Co(NH3)5SO4]NO3+AgBr (0.01 mol)

0.01 mol excess

Similarly, in the second reaction, BaSO4 (Z) will be precipitated.

Hence option C is correct.

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