Q. The pH of a $10^{- 9}$ M solution of $HCl$ in water is
A) 8
B) $- 8$
C) Between 7 and 8
D) Between 6 and 7
Explanation
(d)
As the solution is acidic $pH < 7$. This is because $\lbrack H^{+}\rbrack$ from $H_{2}O\lbrack 10^{- 7}\rbrack$M cannot be neglected in comparison to $10^{- 9}$ M
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.