Metals and Non-metals Test

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Metals and Non-metals Test - 32

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Weekly Quiz Competition

Question 1
1 / -0

Why the grills of doors and windows are always painted before used?

A
To look beautiful

B
To avoid corroison

C
To protect from rain

D
To protect from sunlight

Solution

Usually, grills of doors and windows are made of iron and iron objects get rusted on exposure to moist air. Since air always contains moisture, iron grills get rusted.

Painting iron objects prevents rusting, hence iron grills of doors and windows are painted before they are used.

Hence, option B is correct.
Question 2
1 / -0

Identify the metal that occurs in both combined and native state in nature.

A
Potassium

B
Copper

C
Aluminium

D
Zinc

Solution

Copper is found in both free as well as combined state on Earth as sulphides or oxides ore.
Question 3
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What will you observe when copper ( $Cu$ ) is kept in hydrochloric acid ( $HCl$ )?

A
Slow release of $H_2$ gas

B
Vigorous release of $H_2$ gas

C
Release of water in the form of vapour.

D
No reaction

Solution

The reactivity series follows the order:
$Pb>H>Cu$
Thus, $Cu$ is below hydrogen and can't displace it. Therefore, no reaction would take place between $Cu$ and $HCl$ .
Question 4
1 / -0

The non-metal which is hard is :

A
sulphur

B
chlorine

C
graphite

D
diamond

Solution

Carbon is a non-metal that can exist in different forms. These forms only differ in structure and each form is called an allotrope.

Diamond, an allotrope of carbon, is the hardest natural substance known and has a very high melting and boiling point.

So, the answer is option $D$ .
Question 5
1 / -0

Corrosion of metals can be prevented when contact between metal and .......... is cut off.

A
Nitrogen

B
Hydrogen

C
Oxygen

D
Carbon

Solution

Corrosion of the metal can be prevented if the contact between metal and air is cut off.

Thus Option c is correct.
Question 6
1 / -0

Metals generally react with water to form corresponding oxides or hydroxides and:

A
hydrogen

B
oxygen

C
carbon dioxide

D
carbon monoxide

Solution

Metals react with water to form metal oxides or metal hydroxide and hydrogen.
Some examples are shown:
$2Na + 2H_2O \rightarrow 2NaOH +H_2$
$2K + 2H_2O \rightarrow 2KOH +H_2$
$2Al + 3H_2O \rightarrow Al_2O_3 +3H_2$
Thus, Option $A$ is correct.
Question 7
1 / -0

Metal which does not react even with steam is :

A
potassium

B
iron

C
aluminium

D
silver

Solution

Potassium metal reacts violently with cold water to produce potassium hydroxide and hydrogen gas. This is an exothermic reaction because evolved hydrogen gas immediately catches fire.
Iron and aluminum metal do not react with cold or warm water easily but they react with steam to produce metal oxides and hydrogen gas.
Silver metal does not react with cold water as well as steam because silver metal is very stable.
Hence, option $D$ is correct.
Question 8
1 / -0

Door locks are made of metals because metals:

A
have lustre

B
are opaque

C
are good conductors of heat

D
are hard and strong

Solution

Door locks need to be strong to make sure they are secure. So, we need a hard and strong material for the manufacturing of locks, and metals are most feasible for this purpose.

Metals have lustre, are opaque and good conductors of heat, but these properties have nothing to do with them being used to make locks.
Question 9
1 / -0

Corrosion of iron forms:

A
Mud

B
Dust

C
Rust

D
Water

Solution

Iron when exposed to moist air for a long time acquires a coating of a brown flaky substance called rust.
Question 10
1 / -0

1 kg of iron occupies less space compared to 1 kg of sponge. Why?

A
Iron has less density than sponge

B
Iron and sponge have equal densities

C
Iron has more density than sponge

D
None of the above

Solution

We have 2 materials here in which iron is metal and Sponge is non-metal.
Metals have usually high density as compared to non-metals.
$Density \times Volume = Mass$
Iron occupies less space because it has high density.

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Metals and Non-metals Test - 32

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Metals and Non-metals Test - 32

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Question 1

To look beautiful

To avoid corroison

To protect from rain

To protect from sunlight

Solution

Question 2

Potassium

Copper

Aluminium

Zinc

Solution

Question 3

Slow release of H2H_2H2​ gas

Vigorous release of H2H_2H2​ gas

Release of water in the form of vapour.

No reaction

Solution

Question 4

sulphur

chlorine

graphite

diamond

Solution

Question 5

Nitrogen

Hydrogen

Oxygen

Carbon

Solution

Question 6

hydrogen

oxygen

carbon dioxide

carbon monoxide

Solution

Question 7

potassium

iron

aluminium

silver

Solution

Question 8

have lustre

are opaque

are good conductors of heat

are hard and strong

Solution

Question 9

Mud

Dust

Rust

Water

Solution

Question 10

Iron has less density than sponge

Iron and sponge have equal densities

Iron has more density than sponge

None of the above

Solution

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Slow release of $H_2$ gas

Vigorous release of $H_2$ gas