Question

An element $\epsilon$ reacts with water to form a solution which turns phenolphthalein solution pink. The element $\epsilon$ is mostly likely to be:

• A. $S$
• B. $Ca$
• C. $C$
• D. $Ag$

Answer 1

The correct option is B $Ca$

Acidic solution turns Phenolphthalein solution colourless and Basic solution turns Phenolphthalein solution pink.

$S,C$ oxides are acidic.

$CaO$ is basic. So, it turns Phenolphthalein solution pink.