ICSE Class 10 Chemistry 2023 Solved Paper

Study the following observations and name the anions present in each of the reactions.

Question : 59

Total: 88

When few drops of dilute sulphuric acid is added to Salt ' R ' and heated, a colourless gas is released which turnsmoist lead acetate paper silvery black.

Solution:

' R ' is sodium sulphide. When it heated with. dil. H2SO4 a colourless gas H2S is released which turns moist lead acetate paper to silvery black, due to the formation of lead sulphide.
‌

Na2S

′R′

+‌H2

SO4

‌ dil. ‌

→‌Na2SO4+H2S↑
(CH3‌COO)2‌Pb+H2S→‌

PbS

‌ Black ‌

+CH3‌COOH
Anion is S2− (Sulphide)

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