Question

The percentage of oxygen in $NaOH$ is

• A. 40
• B. 60
• C. 8
• D. 10

Answer 1

Answer: (A)

40

Answer 2

$\because$ 40gm NaOH contains 16gm of oxygen

$\therefore$ 100gm of NaOH contains $\frac{16}{40} \times 100$=40% oxygen.