Q. Which statement is false? (Assume complete dissociation in each case)
A) If 2.0 L of a solution of $H_{2}SO_{4}$ contains 0.1 mole, then pH of the solution is 2
B) The concentration of $OH^{-}\ in\ 0.005\ M\ HNO_{3}\ is\ 2.0 \times 10^{- 12}$ mol/L
C) The pH of 0.01 M $KOH\ is\ 12$
D) In a 0.001 M solution of $NaOH$ the concentration of $H^{+}is\ 10^{- 3}$ mol/L
Explanation
(d)
In 0.001 M $NaOH$,
$\left\lbrack OH^{-} \right\rbrack = 0.001 = 10^{- 3}$
$\therefore$ $\left\lbrack H^{+} \right\rbrack = \frac{10^{- 14}}{\lbrack OH^{-}\rbrack} = \frac{10^{- 14}}{10^{- 3}} = 10^{- 11}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.