0.010
0.020
0.100
0.150
Correct answer is B
fracCaVaCbVb = fracNaNb
( 0.01 X 20 ) / (Cb X 20) = 1 / 2
cross multiply → Cb = (0.01 X 20 X 2) / ( 20 X 1)
Cb = 0.02 mol/dm3
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