Correct Answer: Option D

Explanation

Given:

Volume, V = 500cm\(^3\)

Concentration , C = 0.2 M

n = \(\frac{CV}{1000}\)

n = \(\frac{{0.2}\times{500}}{1000}\)

n = 0.1 mole

Also, recall that n = \(\frac{mass}{Molar mass}\) = \(\frac{m}{M}\)

                          m = n X M 

Molar mass of NaOH = 23 + 16 + 1 = 40g/mol

                          m = 0.1 x  40 = 4g

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