Page 62 - NCERT Science Class 10 English Medium

8. In the electrolytic refining of a metal M, what would you take as the anode, the
cathode and the electrolyte?
9. Pratyush took sulphur powder on a spatula and heated it. He collected the gas
evolved by inverting a test tube over it, as shown in figure below.
(a) What will be the action of gas on
(i) dry litmus paper?
(ii) moist litmus paper?
(b) Write a balanced chemical
equation for the reaction
taking place.
10. State two ways to prevent the
rusting of iron.
11. What type of oxides are formed when
non-metals combine with oxygen?
12. Give reasons
(a) Platinum, gold and silver are
used to make jewellery.
(b) Sodium, potassium and
lithium are stored under oil.
(c) Aluminium is a highly reactive
metal, yet it is used to make
utensils for cooking.
(d) Carbonate and sulphide ores
are usually converted into Collection of gas
oxides during the process of
extraction.
13. You must have seen tarnished copper vessels being cleaned with lemon or tamarind
juice. Explain why these sour substances are effective in cleaning the vessels.
14. Differentiate between metal and non-metal on the basis of their chemical properties.
15. A man went door to door posing as a goldsmith. He promised to bring back the
glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold
bangles to him which he dipped in a particular solution. The bangles sparkled
like new but their weight was reduced drastically. The lady was upset but after a
futile argument the man beat a hasty retreat. Can you play the detective to find
out the nature of the solution he had used?

16. Give reasons why copper is used to make hot water tanks and not steel (an alloy
of iron).

Metals and Non-metals 57

2024-25