Question

Metals generally react with dilute acids to produce hydrogen gas. Which one of the following metals does not react with dilute hydrochloric acid?​

• A. magnesium
• B. aluminium
• C. iron
• D. copper

Answer 1

The correct option is D

copper

Explanation for correct answer:-

Option (D)

• According to Reactivity Series, the order of elements from most reactive to least reactive is as follows:$\mathrm{Mg}>\mathrm{Al}>\mathrm{Fe}>\mathrm{H}>\mathrm{Cu}$
• Clearly reactivity of Magnesium (Mg), Aluminium (Al), and Iron (Fe) is greater than Hydrogen (H) so they will react with Hydrochloric Acid (HCl).
• And the reactivity of Copper (Cu) is lesser than Hydrogen (H), therefore Copper (Cu) will not react with Hydrochloric Acid (HCl).
• Copper will not react with Hydrochloric Acid.

Therefore, option (D) copper is the correct answer.