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Equal mass of a solute are dissolved in equal mass of two solvents \( A \) and \( B \) and formed very dilute solution. The relative lowering of vapour pressure for the solution \( B \) has twice the relative lowering of vapour pressure for the solution \( A \). If \( M_{A} \) and \( M_{B} \) are the molecular mass of solvents \( A \) and \( B \) respectively, then:
(a) \( M_{A}=M_{B} \)
(b) \( M_{B}=2 \times M_{A} \)
(c) \( M_{A}=4 M_{B} \)
(d) \( M_{A}=2 M_{B} \)
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