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NEET · Chemistry · STD 11 - 1. Some basic concept of chemistry
The density of \(2\; \mathrm{M}\) aqueous solution of \(\mathrm{NaOH}\) is \(1.28 \;\mathrm{g} / \mathrm{cm}^{3} .\) The molality of the solution is.....\(m\) [Given that molecular mass of \(\mathrm{NaOH}=40 \;\mathrm{g} \mathrm{mol}^{-1}\)]
- A \(1.20 \)
- B \(1.56\)
- C \(1.67\)
- D \(1.32\)
Answer & Solution
Correct Answer
(C) \(1.67\)
Step-by-step Solution
Detailed explanation
\(2 \mathrm{M}\) solution of \(\mathrm{NaOH}\) means 2 mole \(\mathrm{NaOH}\) is present in \(1 \mathrm{L}\) solution; density \(=1.28 \mathrm{g} / \mathrm{ml}\) mass of solution \(=\) volume of solution \(\times\) density \(=1000 \times 1.28\)
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