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STANDARD Chemistry Molality MCQ Question

Type: MCQ-numerical-Medium-Class 12

What will be the molality of the solution made by dissolving 10 g of NaOH in 100 g of water?

A

2.5 m

B

5 m

C

10 m

D

1.25 m

Correct Answer

Option A

Detailed Explanation

Molality is calculated using the formula: m=Wt. of soluteMol. wt. of solute×1000Wt. of solventm = \frac{\text{Wt. of solute}}{\text{Mol. wt. of solute}} \times \frac{1000}{\text{Wt. of solvent}}. Here, m=1040×1000100=2.5 mm = \frac{10}{40} \times \frac{1000}{100} = 2.5 \text{ m}.

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