Question

Molarity of $4\%$ (w/v) solution of $NaOH$ is:

• A. $0.1$
• B. $0.5$
• C. $0.001$
• D. $1.0$

Answer 1

Answer: (D)

$1.0$

$4\%$ (w/v) means $4gm$ of $NaOH$ in $100ml$.

The molecular mass of $NaOH$ is = $40$

So, $Molarity=\frac{4}{40}\times \frac{1000}{100}$$=1M$

The correct option is $D$.