Question

Eltral,
Non!
metals
Non-metals form oxides WII
to form hydrides.
EXERCISES
A pair of tongs
NaCl solution and copper metal
(a)
Test tube
an front
-Spatula containing
(d
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
(1) dry litmus paper?
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
sulphur powder
used to make jewellery.
Sodium, potassium and
lithium are stored under oil.
(c) Aluminium is a highly reactive
metal, yet it is used to make
utensils for cooking
Carbonate and sulphide ores
are usually converted into
oxides during the process of
extraction.
Burner
rusting?
(a) Applying grease
(b) Applying paint
(C) Applying a coating of zinc
(d) All of the above.
Collection of gas
(a)
calcium
(b)
carbon
(c) silicon
(d)
iron.
(a) zinc is costlier than tin.
(b) zinc has a higher melting point than tin.
(c)
zinc is more reactive than tin.
zinc is less reactive than tin.
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?
of iron).
non-metals?
non-metals.
which will not.
57
Non-metals do not displace hydrogen from dilute acids. They te
1. Which of the following pairs will give displacement reactions?
(b) MgCl, solution and aluminium metal
(C) FeSO, solution and silver metal
AgNO, solution and copper metal.
3. An element reacts with oxygen to give a compound with a high melting
compound is also soluble in water. The element is likely to be
5. You are given a hammer, a battery, a bulb, wires and a switch.
(a) How could you use them to distinguish between samples of 16. Give reasons why copper is used to make hot water tanks and not steel (an alloy
(b) Assess the usefulness of these tests in distinguishing between me
6. What are amphoteric oxides? Give two examples of amphoteric oxides,
2. Which of the following methods is suitable for preventing a
4. Food cans are coated with tin and not with zinc because
7. Name two metals which will displace hydrogen from dilute acids, and to​

Answer 1

Explanation:

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

(b) Assess the usefulness of these tests in distinguishing between me

6. What are amphoteric oxides? Give two examples of amphoteric oxides,

2. Which of the following methods is suitable for preventing a

4. Food