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Ch 3 Metals and Non-metals for class 10
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Some examples from this set of practice questions
1.
Explain why calcium metal after reacting with water starts floating on its surface. Write the chemical equation for the reaction. Name one more metal that starts floating after some time when immersed in water.
Answer: When calcium metal reacts with water, it produces hydrogen gas and calcium hydroxide. The hydrogen gas bubbles stick to the surface of the calcium, creating buoyancy, causing calcium to float on the water\'s surface. The chemical equation for the reaction is: Ca (s)+2H2O (l)→Ca(OH)2(aq)+H2(g)
2.
A non-metal X exists in two different forms, Y and Z. Y is the hardest natural substance, whereas Z is a good conductor of electricity. Identify X, Y, and Z.
Answer: X is carbon. Diamond and graphite are allotropes of carbon. Diamond is the hardest natural substance, and hence Y is diamond. Graphite is a good conductor of electricity, and hence Z is graphite.
3.
Why do ionic compounds conduct electricity in molten state and not in solid state?
Answer: Ionic compounds do not conduct electricity in solid state because ions are not free to move. In molten state, ions are free to move
4.
The reaction of metal X with Fe O is highly exothermic and is used to join railway tracks. Identify metal X. Write the chemical equation for the reaction
Answer: X is Aluminium. 2Al + Fe 0 Al O + 2Fe
5.
Differentiate between roasting and calcination.
Answer: Roasting Calcination (a) Ore is heated in excess (a) Ore is heated in the absence or of air. limited supply of air. (b) This is used for sulphide (b) This is used for carbonate ores. ores. (c) SO2 is produced along (c) CO2 is produced along with with metal oxide. metal oxide.
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