Question

Iron filings and sulphur were mixed together and divided into two parts ‘A and S, Part A, was heated strongly while Part ‘S’ was not heated. Dilute hydrochloric acid was added to both the parts and evolution of gas was seen in both the cases. How will you identify the gases evolved?

June 26, 2024

Answer

Part A

𝐹𝑒(𝑠) + 𝑆(𝑠) → ^{𝐻𝑒𝑎𝑡} 𝐹𝑒𝑆(𝑠)

𝐹𝑒𝑠(𝑠) + 2𝐻𝐶𝑙(𝑎𝑞) → 𝐹𝑒𝐶𝑙2(𝑎𝑞) + 𝐻2𝑆(𝑔)

Part B

Fe(s) + S(s) → Mixture of iron filings and sulphur

When dilute HCl is added to it

Fe(s) + S(s) + 2HCI(aq) → FeCl2(aq) + H2(g)

Sulphur remains unreacted.

H2S gas formed has a foul smell and on passing through lead acetate solution, it turns the solution black. Hydrogen gas burns with a pop sound.

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