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NEET levelSingle correct optionDifficulty 1 of 3so114

The molarity of a solution containing $4.0 g$ of $NaOH$ (molar mass $40 g mo l^{- 1}$ ) in $500 mL$ of solution is

A $0.10 M$
B $0.05 M$
C $0.20 M$
D $0.40 M$

Answer: C

Molarity is moles of solute per litre of solution.

n = 4.0/40 = 0.10

mol and

V = 0.500

L. So

M = 0.10/0.500 = 0.20 M

. Using 1 L instead of 0.5 L gives the wrong value

0.10

M.

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