Correct Answer: Option C

Explanation

Note that   Number of moles =  \(\frac{mass}{Molar mass}\)

                             n =  \(\frac{10}{40}\) = 0.25 mol.

⇒  0.25 mol of Sodium hydroxide is dissolved in 1000cm\(^3\) = 1 dm\(^3\)

i.e 0.25mol dm\(^3\)

There is an explanation video available below.

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