JEE Main Chemistry question

Chemistry Equilibrium JEE Main

How many gram of NaOH must be present in one litre of the solution to give it a pH of 12?

(A)0.20 g litre⁻¹
(B)0.4 g litre⁻¹Correct
(C)4.0 g litre⁻¹
(D)0.10 g litre⁻¹

Answer: (B)

Solution

[OH⁻]=10⁻²M; mass=0.01×40=0.4 g.

Question ID VK-136221