When `20 mL` of `M//20NaOH` is added to `10mL` of `M//10 HCI`, the resulting solution will

Options

A. Turn blue litmus red.
B. Turn phenolpthalein solution pink.
C. Turns methy orange red.
D. Will have no effect on either red or blue litmus

Answer

D

Explanation

mEq of `NaOH = 20 xx (1)/(20) = 1`
mEq of `HCI = 10 xx (1)/(10) = 1`
So, slat of `S_(A)//S_(B) (NaCI)` will be formed which do not hydrolyse and `pH = 7`. So at `pH = 7`, litmus has no effect. Since, blue litmus turns red a acidic solution, and red litmus turns blue, a basic solution.
i. phenolphtalein solution turns pink a basic solution of `pH gt 7`.
iii. Methy1 orange turns red a acidic solution of `pH lt 7`.