The molarity of a NaOH solution by dissolving $4 g$ of it on $250 m L$ water is:

0.4 M

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0.8 M

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0.2 M

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0.1 M

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Solution

The correct option is D $0.4 M$
Molarity is defined as the moles of a solute per liters of a solution. Molarity is also known as the molar concentration of a solution.
Molarity(M) = $\frac{n o . o f m o l e s}{v o l u m e o f s o l u t i o n (l i t)} = \frac{m a s s}{G r a m m o l e c u l a r m a s s} \times \frac{1000}{V (m l)}$
where,
given mass of the solute = 4g
GMW = Gram Molecular Weight of the solute = 40g
V = Volume of the solution in ml. = 250 ml
Molarity $= \frac{m o l e}{v o l u m e} = \frac{\frac{4}{40}}{\frac{250}{1000}} = 0.4 M$

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