Study of Compounds
ICSE · Class 10 · Chemistry
Most important questions from Study of Compounds for ICSE Class 10 Chemistry board exam 2026. MCQs, short answer, and long answer questions with marks.
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Which of the following are correct properties of ammonia gas?
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Colourless gas, Lighter than air, Highly soluble in water, Pungent smell
Ammonia is colourless, lighter than air (VD = 8.5), highly soluble in water, has a pungent smell, and is basic in nature, not acidic.
The brown ring test is used to identify:
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Nitrates
The brown ring test using FeSO4 and conc. H2SO4 is specific for nitrates. A brown ring of nitroso ferrous sulphate (FeSO4.NO) forms at the junction of two liquids.
Which of the following are products when copper reacts with concentrated nitric acid?
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Copper nitrate, Nitrogen dioxide, Water
When copper reacts with concentrated nitric acid: Cu + 4HNO3 → Cu(NO3)2 + 2NO2 + 2H2O. No hydrogen gas is produced as nitric acid acts as an oxidizing agent.
Aqua regia is a mixture of:
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1 part HNO3 + 3 parts HCl
Aqua regia is a mixture of 1 part concentrated nitric acid and 3 parts concentrated hydrochloric acid by volume. It can dissolve noble metals like gold and platinum.
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