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Question

# 2M of 100ml of Na2SO4 is mixed with 3M of 100ml NaCl solution and 1M of 200ml CaCl2 solution. Then the ratio of the concentration of cation and anion.

A
1/2
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B
2
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C
1.5
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D
1
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Solution

## The correct option is D 1mole=M×1000V(in ml)Na2SO4→2Na++SO2−4 0.2 0 0 0.4 0.2[Na+]=(0.4/100)×1000=4M[SO2−4]=(0.2/100)×1000=2MNaCl→Na++Cl− 0.3 0 0 0.3 0.3[Na+]=[Cl−]=(0.3/100)×1000=3MCaCl2→Ca2++2Cl− 0.2 0 0 0.2 0.4[Ca2+]=(0.2/100)×1000=2M[Cl−]=(0.4/100)×1000=4MRatio of concentration of cation and anion =4+3+22+3+4=1Option A is correct.

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