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ICSE Class 10 Chemistry Question 14 of 18

Solved 2020 Question Paper ICSE Class 10 Chemistry — Question 14

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14
Question

Question 6(b)

Identify the substance underlined in each of the following:

(i) The electrode that increases in mass during the electro-refining of silver.

(ii) The acid that is a dehydrating as well as a drying agent.

(iii) The catalyst used to oxidize ammonia into nitric oxide.

Answer

(i) Cathode

Reason — Pure copper is deposited on the thin sheet of pure copper placed at the cathode

(ii) Sulphuric acid

Reason — Being hygroscopic sulphuric acid absorbs moisture but not enough to form a solution. Hence, it is a drying agent.

Sulphuric acid is a dehydrating agent as it can remove chemically combined water molecules from blue vitriol.

CuSO4.5H2O + H2SO4 ⇌ CuSO4 + 5H2O

(iii) Platinum

4NH3+5O2→800°CPt.4NO+6H2O+Δ4\text{NH}_3 + 5\text{O}_2 \xrightarrow[800 \degree \text{C}]{\text{Pt.}} \text{4NO} + \text{6H}_\text{2}\text{O} + \Delta