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Reaction between which of the following will NOT lead to the evolution of Hydrogen gas? (A) Magnesium with dilute hydrochloric acid (B) Copper with dilute hydrochloric acid (C) Sulphur powder with dilute hydrochloric acid (D) Aluminium with dilute hydrochloric acid

Reaction between which of the following will NOT lead to the evolution of Hydrogen gas? (A) Magnesium with dilute hydrochloric acid (B) Copper with dilute hydrochloric acid (C) Sulphur powder with dilute hydrochloric acid (D) Aluminium with dilute hydrochloric acid Correct Answer B and C

The correct answer is B and C.

Explanation:

Magnesium with dilute hydrochloric acid

  • When magnesium is treated with dilute hydrochloric acid, it forms magnesium chloride and emits hydrogen gas.

Mg (s) + 2HCl (aq) →  MgCl2 (aq) + H2(g)

Copper with dilute hydrochloric acid

  • The metal reactivity series governs metal reactivity. Metals placed above hydrogen react with dilute acids to form salt, whereas metals placed below hydrogen do not react with dilute acids because they are less reactive than hydrogen and thus cannot displace hydrogen from dilute acids.
  • Copper is unreactive because it is placed below hydrogen in the metal reactivity series, and thus it cannot displace hydrogen from dilute hydrochloric acid.

Sulphur powder with dilute hydrochloric acid

  • Sulphur does not react with hydrochloric acid because Sulphur is a non-metal and non-metals do not react with acids.

Aluminium with dilute hydrochloric acid

  • At room temperature, aluminium reacts with diluted hydrochloric acid. Aluminum chloride and colourless hydrogen gas are produced when the metal aluminium dissolves in hydrochloric acid. The reaction between aluminium and hydrochloric acid is irreversible.

2Al + 6HCl → 2AlCl3 + 3H2

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