Question

0.1 M solution of which of the substances will behave basic?

• A. Sodium borate
• B. Ammonium ditoride
• C. Calcium nitrate
• D. Sodium sulphate

Answer 1

The correct option is A Sodium borate

As we know, $pH=-log\left[H^{+}\right]$

For neutral solution, $pH=7$

For acidic solution, $pH<7$

For basic solution, $pH>7$

Here, $\left[H^{+}\right]=20\times 0.1=\left[O{H}^{-}\right]$

Sodium borate is a weak acid - strong base solution. So it's solution will be basic and its $pH$ will be greater than $7$.