KVPY 2019 SB SX Exam Previous Papers

Question : 108 of 120

Marks: +1, -0

3.0 g of oxalic acid [(CO

_2

_2

.2H

_2

O] is dissolved in a solvent to prepare a 250 mL solution. The density of the solution is 1.9 g/mL. The molality and normality of the solution. Respectively, are closest to

0.10 and 0.38
0.10 and 0.19
0.05 and 0.19
0.05 and 0.09

Validate

Solution:

Mass of solution = d" × v" = 1.9 × 250 = 475 gram
Mass of solvent = (475 – 3) = 472 gram
Molality =

{3 ×1000}/{126 ×472}= 0.05

Normality =

{3 ×1000}/{63× 250}= 0.19

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