Question

When a drop of an unknown solution is placed on a strip of $pH$ paper, a deep red colour is produced. This sample should be which one of the following?

• A. $NaOH$
• B. $HCl$
• C. $H_{2}O$
• D. $C{H}_{3}COOH$

Answer 1

Answer: (B)

$HCl$

Deep red colour is obtained by a strong acid which is nothing but $HCl$ in this case.