Metals and Non-metals Test

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Metals and Non-metals Test - 33

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Weekly Quiz Competition

Question 1
1 / -0

To protect iron from corrosion and rust, it is coated by:

A
Tin

B
Copper

C
Zinc

D
Mercury

Solution

The iron is coated with zinc. This stops the corrosion and rust of iron. This process is called galvanization. This zinc stops oxygen and water from reaching the metal underneath. Hence, option $$C$$ is correct.
Question 2
1 / -0

Which chemical reaction correctly represents the reaction between iron and dilute $$H_2SO_4$$?

A
$$Fe + H_2SO_4 \rightarrow FeSO_4 + H_2$$

B
$$2Fe + 3H_2SO_4 \rightarrow Fe_2(SO_4) + 3H_2$$

C
$$2Fe + 3H_2SO_4 \rightarrow Fe_2(SO_4)_3 + H_2$$

D
$$2Fe + H_2SO_4 \rightarrow Fe_2(SO_4)_3 + 3H_2$$

Solution

When Fe reacts with dilute $$H_2SO_4$$, ferrous (II) sulphate is formed with the evolution of hydrogen gas.

$$Fe + H_2SO_4 \to FeSO_4 + H_2$$

Hence, the correct option is $$\text A$$.
Question 3
1 / -0

Different techniques are used for obtaining the metals falling in each category. The metals high up in the reactivity series are obtained by:

A
reduction with carbon

B
electrolytic reduction

C
reduction by heating

D
displacement reaction

Solution

Metals such as sodium, magnesium, calcium, aluminium that are high up in the reactivity series are very reactive and cannot be obtained from their compounds by heating with carbon. This is because oxides of these metals are very stable and cannot be reduced by carbon. So these metals are obtained by electrolytic reduction.
Question 4
1 / -0

Name one metal that will not react with cold water but will react with steam.

A
Zinc

B
Silver

C
Calcium

D
Magnesium

Solution

Zinc is a metal which doesn't react with cold water but reacts with steam.

The chemical equation for the reaction can be written as:
$$ Zn + H_{2}O \rightarrow ZnO + H_{2}$$
(steam)

Hence, option A is correct.
Question 5
1 / -0

Which of the following methods is suitable for preventing an iron vessel from rusting ?

A
Applying grease

B
Applying paint

C
Applying a coat of zinc

D
All of the above.

Solution

The rusting of iron can be prevented by painting, greasing or galvanising which is a process of applying a coat of zinc.
Hence, the correct option is $$\text{D}$$.
Question 6
1 / -0

When sodium reacts with cold water, then the product formed will be:

A
$$Na_2O$$

B
$$NaOH$$

C
$$Na_2CO_3$$

D
all of these

Solution

Sodium is very reactive and it reacts with water to form sodium hydroxide which is a very strong base.
Reaction
$$Na + H_2O \rightarrow NaOH + \dfrac12H_2$$
Question 7
1 / -0

Which among the following is a non-metal?

A
Bromine

B
Zinc

C
Sodium

D
Iron

Solution

Bromine is a liquid non-metal. Rest zinc, sodium and iron are all metals.
Question 8
1 / -0

When dilute hydrochloric acid is added to granulated zinc placed in a test tube, the observation made is _____________.

A
the surface of the metal turns hining

B
the reaction mixture turns milky

C
odour of chlorine is observed

D
a colourless and odourless gas evolves with bubbles

Solution

When dilute hydrochloric acid is added to granulated zinc placed in a test tube, a colourless and odourless gas is evolved with bubbles.

The chemical reaction can be written as:

Zn + 2HCl $$\rightarrow$$ ZnCl$$_{2}$$ + H$$_{2}$$

Hence, correct option is $$\text{D}$$.
Question 9
1 / -0

Which of the following methods is employed to prevent rusting?

A
Refining

B
Alloying

C
Greasing

D
both (b) and (c)

Solution

The rusting of iron can be prevented by greasing or alloying but refining is method to obtain pure metal from it's ore, thus, option $$D$$ is correct.
Question 10
1 / -0

A small piece of silver is placed in a solution containing both magnesium nitrate and copper (II) nitrate. Which one of the following occurs?

A
No reaction takes place

B
The silver dissolves and only copper is seen

C
The silver dissolves and only magnesium is seen

D
A mixture of magnesium and copper forms on the silver

Solution

Silver is the metal that is present at the bottom of the reactivity series, below $$Mg$$ and $$Cu$$ metals. So, it cannot displace these metals from its solution. As a result, no reaction takes place with the piece of silver.

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Metals and Non-metals Test - 33

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Metals and Non-metals Test - 33

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Question 1

Tin

Copper

Zinc

Mercury

Solution

Question 2

$$Fe + H_2SO_4 \rightarrow FeSO_4 + H_2$$

$$2Fe + 3H_2SO_4 \rightarrow Fe_2(SO_4) + 3H_2$$

$$2Fe + 3H_2SO_4 \rightarrow Fe_2(SO_4)_3 + H_2$$

$$2Fe + H_2SO_4 \rightarrow Fe_2(SO_4)_3 + 3H_2$$

Solution

Question 3

reduction with carbon

electrolytic reduction

reduction by heating

displacement reaction

Solution

Question 4

Zinc

Silver

Calcium

Magnesium

Solution

Question 5

Applying grease

Applying paint

Applying a coat of zinc

All of the above.

Solution

Question 6

$$Na_2O$$

$$NaOH$$

$$Na_2CO_3$$

all of these

Solution

Question 7

Bromine

Zinc

Sodium

Iron

Solution

Question 8

the surface of the metal turns hining

the reaction mixture turns milky

odour of chlorine is observed

a colourless and odourless gas evolves with bubbles

Solution

Question 9

Refining

Alloying

Greasing

both (b) and (c)

Solution

Question 10

No reaction takes place

The silver dissolves and only copper is seen

The silver dissolves and only magnesium is seen

A mixture of magnesium and copper forms on the silver

Solution

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