Question

Dilute H₂SO₄ and conc. H₂SO₄ can be distinguished by ______.

Options

• Copper 

• Silver

• Gold 

• Platinum

Answer 1

Dilute H₂SO₄ and conc. H₂SO₄ can be distinguished by copper.

Explanation:

Copper does not react with dilute sulphuric acid, but it reacts with hot concentrated sulphuric acid to form copper sulphate, sulphur dioxide, and water.

\[\ce{Cu + 2H2SO4(conc{.}) -> CuSO4 + SO2 + 2H2O}\]

Hence, copper can distinguish dilute H₂SO₄ from concentrated H₂SO₄.