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Q.

If 200 ml of 0.1 M Na2SO4is mixed with 100 ml of 0.2 M Na3PO4 solution, molarity of Na+ in the final solution, if final solution has density 1.2 gm/ml, will be:

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a

0.196 M

b

0.33 M

c

0.5 M

d

none of these

answer is B.

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Detailed Solution

Here,


Na2SO4                 Na3PO4

V=200ml    V=100mlM=0.1    M=0.2

Molarity of Na+

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