JEE Main · 2023 · 10 Apr 2023 · Shift 2 · Some Basic Concepts of Chemistry

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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.
(D)Both A and R are true and R is the correct explanation of A.✓ Correct

Answer: (D)

Solution

Both statements are correct and R explains A. The molar mass of hydrated oxalic acid (

H_{2} C_{2} O_{4} \cdot 2 H_{2} O

) is indeed 126 g/mol. Using the molarity formula:

M = \frac{3.15 \times 1000}{126 \times 250} = 0.1

M. The reason (molar mass value) is the key fact needed to verify the assertion.

JEE Main · 2023 · 10 Apr 2023 · Shift 2 · Single correct option

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JEE Main · 2023 · 10 Apr 2023 · Shift 2 · Some Basic Concepts of Chemistry

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