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Question 1

Some properties are listed in the following table. Distinguish between metals and non-metals on the basis of these properties





Heat Conduction    
Conduction of Electricity    







Have metallic luster

Non-metals are dull

Hardness Hard Soft
Malleability Malleable Not-malleable
Ductility Ductile Not-ductile
Heat Conduction Good conductors Bad conductor
Conduction of Electricity Good conductors Bad conductor/insulator

Question 2

Give reason for the following

a. aluminium foils are used to wrap food items

b. immersion rods for heating liquids are made up of metallic substances

c. copper cannot displace zinc from its salt solution

d. sodium and potassium are stored in kerosene.

a. aluminium is highly malleable metal and it is very easy to make aluminium foil in Comparison to other metals

b. immersion rods are made up of metallic substances because metals are good conductors of heat and electricity

c. copper cannot displace zinc from its solution because zinc is more reactive than copper (i.e, copper is less reactive than zinc)

d. sodium and potassium metals are very reactive because they react with oxygen and water easily. A lot of heat is produced in the reaction .So sodium and potassium metals are always stored in kerosene.

Question 3

Can you store lemon pickle in an aluminium utensil? Explain.


No, this is because acids react with aluminium .


Question 4

Match the substances given in column A with their uses given in column B.

Column A

Column B

i. gold

a. thermometers

iv. carbon


Column A

Column B

i. gold
d. jewellery
ii. iron
e. machinery
iii. aluminium
c. wrapping food

iv. carbon

f. fuel
v. copper
b. electric wire
vi. mercury
a. thermometers

Question 5

What happens when

a. dilute sulphuric acid is poured on a zinc plate?

b. iron nails are placed in copper sulphate solution?

Write word equations of the reactions involved.

a. Zinc sulphate is formed and hydrogen gas is liberated

Zinc + sulphuric acid → zinc sulphate + hydrogen (gas)

b. brown coating is deposited on the iron nails. This is because of the displacement of copper from copper sulphate solution by iron

iron + copper sulphate (solution) → iron sulphate (solution) + copper.

Question 6

Saloni took a piece of burning charcoal and collected the gas evolved in a test tube


a. how will she find the nature of the gas?

b. write down word equations of all the reactions taking place in this process.

a. she will bring a wet litmus paper in contact with the gas. If the gas turns wet blue litmus paper into red, the gas will be acidic

b. i. carbon + oxygen → carbon dioxide

ii. carbon dioxide + water → carbonic acid (from wet litmus).

Question 7

One day Reeta went to a jeweller’s shop with her mother. Her mother gave old gold jewellery to the goldsmith to polish. Next day when they brought the jewellery back, they found that there was a slight loss in its weight. Can you suggest a reason for the loss in weight?


The jeweller’s dip the jewellery in the solution of acid, which reacts with the outer covering of metals. Thus there is a net loss of weight in the metal of the ornament.

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