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Three sols. X, Y, Z of HCl are mixed to produce 100 mL of 0.1 M sol.. The molarities of X, Y and Z are 0.07 M, 0.12 M and 0.15 M respectively. What respective vol. of X, Y and Z should be mixed?

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50 ml, 25 ml, 25 ml

20 ml, 60 ml, 20 ml

40 ml, 30 ml, 30 ml

55 ml, 20 ml, 25 ml

answer is D.

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Detailed Solution

N₁V₁ + N₂V₂ + N₃V₃ = NR(V₁ + V₂ + V₃)
$\Rightarrow$ 0.07 × 55 + 0.12 × 20 + 0.15 × 25 = 0.1

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