Question

Which of the following pair does not react either with cold or hot water?

• A. $Na,K$
• B. $Al,Mg$
• C. $Ca,Fe$
• D. $Fe,Zn$

Answer 1

The correct option is D $Fe,Zn$

Generally metal react with water to form metal oxide and hydrogen gas.
Metals like potassium and sodium react violently with cold water.
Calcium react with cold water less violently.
Magnesium does not react with cold water. It reacts with hot water.
Metals like aluminium, iron and zinc do not react either with cold or hot water. But they react with steam to form the metal oxide and hydrogen.