Question

The metal which does not liberate hydrogen gas after reacting with acid is-

A ZINC
B LEAD
C IRON
D GOLD

Answer 1

Answer:

gold

Explanation:

Copper, silver, gold and platinum being less reactive than hydrogen cannot displace hydrogen from acids.

Metals that are more reactive than hydrogen can displace hydrogen from acids. These metals include sodium, potassium, lead and zinc.

Answer 2

The correct answer is Gold (Option D).

• The metals generally liberate hydrogen gas after reacting with acids only if they are highly reactive than Hydrogen.
• The reactivity of metal can be determined using the metal reactivity series.
• The metal activity series provides information about the order of reactivity of the metal .
• The metal reactivity order is Pottasium> Sodium > Lithium > barium > Strontium> Calcium> Magnesium> Aluminum> Manganese> Zinc> Chromium> Iron> Cobalt> Nickel> Tin> Lead >hydrogen >Copper>Mercury> Silver> Gold> Platinum.

• From the mentioned order above, The elements which are below Hydrogen are comparatively lesser reactive than Hydrogen.
• From the given options Zinc, Lead, and Iron are above hydrogen in the reactivity series. So they can liberate hydrogen gas after reacting with acid.
• Gold is less reactive than Hydrogen. Hence Gold cannot liberate Hydrogen gas when it is reacted with acid.

Hence Option D (GOLD) is the correct option.