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Question

50 gm of a compound (molar mass 200 gm/mol and density 0.6 gm/ml) is mixed in 200 gm of a solvent (density 1.2 kg/L)
List-I contains concentration terms for the solutions formed and List-II contains the concentration.
List-I List-II(I)Molarity (mol/L)(P)20(II)Molality (mol/kg)(Q)0.67(III)% mass by mass (R)1.2(IV)% mass by volume (g/ml)(S)1(T)25(U)1.25

Which of the following options has the correct combination considering List-I and List-II

A
(II),(S) and (III),(T)
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B
(II),(U) and (III),(T)
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C
(II),(R) and (II),(P)
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D
(II),(U) and (III),(P)
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Solution

The correct option is D (II),(U) and (III),(P)
(II) Molality,
m=502002001000=54=1.25 mol/kg.
(III) Mass of the solution =50 g+200 g=250 g
% by mass of the solution=(50250)×100=20

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