Question

A student added a drop of universal indicator to 1ml of a solution that changed to purple colour. The solution can be

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

Answer 1

The correct option is B $NaOH$


a) HCl being a strong acid, will change the colour to red.
b) NaOH being a strong base, will change the colour to purple.
c) $H_{2}O$ being neutral, will change the colour to green.
d) $C{H}_{3}COOH$ being a weak acid, will change the colour close to lime green.