Question

Indicator $U$ could be used to distinguish between $0.1M$ and $0.01M$ solution of sulphuric acid.

• A. True
• B. False

Answer 1

The correct option is A True

The indicator $U$ changes its colour from yellow to blue in a $pH$ range of $0$ to $1.6$.

now, $pH$ of $0.1M$ $H_2{SO}_4=-log0.2=0.69$

$pH$ of $0.01M$ $H_2{SO}_4=-log0.02=1.69$

So, $U$ will be yellow in colour in solution of $0.1M$ $H_2{SO}_4$ but blue in $0.01M$ $H_2{SO}_4$ solution.