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STD 12 -1. Solution and colligative properties — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 -1. Solution and colligative properties4 Marks
MCQ
Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R.$

Assertion $A:$ $3.1500\,g$ of hydrated oxalic acid dissolved in water to make $250.0\,mL$ solution will result in $0.1\,M$ oxalic acid solution.

Reason $R:$ Molar mass of hydrated oxalic acid is $126\,g\,mol ^{-1}$.

In the light of the above statements, chose the correct answer from the options given below:

  • A
    Both $A$ and $R$ are true but $R$ is NOT the correct explanation of $A$.
  • B
    $A$ is false but $R$ is true.
  • C
    $A$ is true but $R$ is false.
  • ✓
    Both $A$ and $R$ are true and $R$ is the correct explanation of $A$.
✓

Answer

Correct option: D.
Both $A$ and $R$ are true and $R$ is the correct explanation of $A$.
d
Assertion is correct.

$H _2 C _2 O _4 \cdot 2 H _2 O$

$M =\frac{3.15 \times 1000}{126 \times 250}$

$\frac{12.6}{126}=0.1$

Reason is correct. It is used as a fact in explanation of assertion.

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