CBSE Class 10 Science Sample Paper 2020 Set E

I. 1 mark Questions.

1.. Name two elements that are stored in kerosene.
2. What will happen when a strip of copper is kept immersed in a solution of silver nitrate?
3. State any two ways to prevent the rusting of iron.
4. What type of oxides are formed when non-metals combine with oxygen?
5.Write the chemical equation to represent the reaction taking place when copper oxide is heated in a stream of hydrogen.
6. Write the electronic configuration of Sulphur atom and sulphide ion.
II. 2 Mark Questions.
1. What is the nature of the oxide SO2 and Na2O? What happens when they are dissolved in water? Write the chemical equation?
2. Explain why, metals usually do not liberate hydrogen gas with dilute nitric acid. Give examples of two metals which however liberate H2 gas.
3. Why does aluminium not react with water under ordinary conditions?
4. The reaction of a metal X with Fe2O3 is highly exothermic and is used to join broken railway tracks. Identify metal X. Write the chemical equation of its reaction with Fe2O3.
5. Metal sulphides occurs mainly in rocks and the metal halides occur mostly in seas and lakes. What could be the reason for this difference in behavior?
6. Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test-tube over it.
(i) What will be the action of gas an (a) dry litmus paper? (b) Moist litmus paper?
(ii) Write a balanced chemical equation for the reaction taking place.
7. Which gas is produced when diluted hydrochloric acid is added to a reactive metal? Write the chemical reaction. When iron reacts with dilute H2SO4.
8. Why do ionic compounds have high melting points?
9. Give reasons
(i) Platinum, gold and silver are used to make jewellery.
(ii) Aluminium is a highly reactive metal, still it is used to make utensil for cooking.
10. (i) What is corrosion of metals? Name one metal which does not corrode and one which corrodes on being kept in atmosphere. (ii) How will you show that the rusting of iron needs oxygen and moisture at the same time?
11. Differentiate between metal and non-metal on the basis of their chemical properties.
12. Why copper is used to make hot water tanks and not steel (an alloy of iron).
13. What is an alloy? Name the constituents of 22-carat gold. Why is 24-carat gold converted to 22-carat gold?
14. Why are metals good conductors of electricity?
15. Give reasons for the following: (a) Zinc oxide is considered as amphoteric oxide. (b) Nonmetals in general do not displace hydrogen from dilute acids.

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