Question

reacts vigorously with cold water.

• A. Na
• B. Zn
• C. Ca

Answer 1

The correct option is A Na

Sodium (Na) is a highly reactive metal and it reacts vigorously with cold water.

$2Na\left(s\right)+H_{2}O\left(l\right)\to 2NaOH\left(aq\right)+H_2\left(g\right)$

Calcium (Ca) too reacts with cold water. But the reaction is not vigorous.

$Ca\left(s\right)+2H_{2}O\left(l\right)\to Ca\left(OH{)}_2\right(aq)+H_2(g)$

Zn does not react with cold water. However, it reacts with steam.