Study of Compounds — Important Questions
ICSE · Class 10 · Chemistry
44 important questions from Study of Compounds for ICSE Class 10 Chemistry, with answers. Includes multiple choice and multiple correct questions.
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See them allImportant Questions from Study of Compounds
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 prepared by mixing one part by volume of concentrated nitric acid with three parts by volume of concentrated hydrochloric acid. This mixture is powerful enough to dissolve noble metals like gold and platinum because the nitric acid oxidises HCl to release highly reactive nascent chlorine. The reversed ratio or equal parts do not correspond to the actual composition of aqua regia.
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