Chemistry - Metallurgy Question with Solution | TestHub

Reactivity with Acids: Metal 'M' does not react with dilute H₂SO₄, indicating it is below hydrogen in the reactivity series. However, it reacts with hot concentrated H₂SO₄ to form a metal sulfate and SO₂ gas.

MacArthur-Forrest Process: The metal sulfate solution reacts with excess NaCN to form a soluble complex, which is then reduced by Zn dust to precipitate the pure metal (M).

Conclusion: This sequence is characteristic of the extraction and purification of Silver (Ag). Gold (Au) would not react with concentrated H₂SO₄, while Fe and Al would react with dilute H₂SO₄.

Therefore, the correct option is (A) Ag.