Materials Metals and Non Metals Test

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Materials Metals and Non Metals Test - 19

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is an insulator?

A
Copper

B
Iron

C
Sulphur

D
Graphite

Solution

Unlike metals which have a 'sea' of free electrons that can be used to conduct electricity, Sulphur is an insulator.

Copper and iron being metals conduct electricity due to the presence of free electrons.

Graphite conducts electricity due to the motion of non bonded electrons between its adjacent layers.
Question 2
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Soft metal(s) which can be cut with a knife is(are) :

A
Lithium

B
Potassium

C
Sodium

D
A, B and C

Solution

Metals, such as Lithium, Sodium and Potassium can be cut with a knife as they are very soft compared to other metals.
Question 3
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Which of the following observations most strongly suggest that a solid element X is a non- metal?

A
X forms an acidic oxide.

B
X has a high melting point

C
X is a conductor of electricity.

D
X reacts vigorously with chlorine.
Question 4
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Generally, metallic oxides are basic and non-metallic oxides are acidic in nature. Solution of which of the following oxides in water will change the colour of blue litmus to red?

A
Sulphur dioxide

B
Magnesium oxide

C
Iron oxide

D
Copper oxide

Solution

The oxides of metal are basic in nature or in other words they react with acids to form salt and water. In the case of non-metals, they are acidic in nature and form acids when they dissolve in water.

When sulphur dioxide is dissolved in water sulphurous, acid is formed. The reaction can be given as follows:

$$SO_2 + H_2O \rightarrow H_2SO_3$$

The sulphurous acid turns blue litmus paper red.
Question 5
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Non-metals which are present in fertilizers and enhance the growth of plants is:

A
nitrogen

B
phosphorus

C
potassium

D
both $$A$$ and $$B$$

Solution

Non-metals which are present in fertilizers and enhance the growth of plants are nitrogen and phosphorus. Potassium is a metal. It is also present in fertilizers.
Question 6
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Paheli prepared a blue coloured solution of copper sulphate in beaker A and placed an iron nail in it. Boojho prepared a yellowish green solution of ferrous sulphate in beaker B and placed a copper wire in it. Changes they observe in the two beakers after an hour will be :

A
in beaker A, no change ; in beaker B, change to green

B
in beaker A, no change ; in beaker B, no change

C
in beaker A, changes to green ; in beaker B, no change

D
in beaker A, changes to green ; in beaker B, change to blue

Solution

Fe displaces the Cu from $$CuSO_{4}$$ solution in beaker A as Fe is more reactive than Cu.

Therefore the blue colour of the solution changes to green due to the formation of $$FeSO_{4}$$.

In beaker B, no reaction takes place as $$Cu$$ being less reactive cannot displace $$Fe$$ from $$FeSO_{4}$$ solution.

Hence the correct option is C.
Question 7
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An alloy which is sonorous is:

A
duralumin

B
bell metal

C
type metal

D
gun metal

Solution

A sonorous alloy is bell metal.
Bell metal (copper, tin)
Type metal (lead, tin, antimony)
Duralumin (copper, aluminum)
Gunmetal (Copper, Tin, zinc)
Question 8
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Compound can be reduced to copper when heated with coke is

A
Copper hydroxide

B
Copper oxide

C
Copper sulphide

D
All of these

Solution

The metals, which are low in the reactive series, undergo reduction reaction. Their metal oxides react with carbon to reduce the metal oxide to its metal and form an oxide of carbon.
$$2CuO+C \rightarrow 2Cu+CO_2$$
Question 9
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X is an element in the form of a powder. X burns in oxygen and the product is soluble in water. The solution is tested with litmus. If X is a non metal, then the litmus will turn:

A
Red to blue

B
Blue to red

C
No change on red litmus

D
Both $$B$$ and $$C$$

Solution

If "X" is non-metal then its oxide is acidic and when dissolved in water gives acid.

We know acids turn blue litmus red.

So, the blue litmus will turn red while the red litmus remains the same.

So, Option (D) is correct.
Question 10
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Compare the properties of a typical metal and a non-metal on the basis of the following.

Conductivity of heat and electricity:

A
Metals are good conductor of heat and electricity.

B
Non metals are good conductor of heat and electricity.

C
Metals are bad conductor of heat and electricity.

D
Both B and C

Solution

Metals have free electrons which can conduct heat and electricity, So, metals are good conductor of heat and electricity.

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Materials Metals and Non Metals Test - 19

Result

Materials Metals and Non Metals Test - 19

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Question 1

Copper

Iron

Sulphur

Graphite

Solution

Question 2

Lithium

Potassium

Sodium

A, B and C

Solution

Question 3

X forms an acidic oxide.

X has a high melting point

X is a conductor of electricity.

X reacts vigorously with chlorine.

Question 4

Sulphur dioxide

Magnesium oxide

Iron oxide

Copper oxide

Solution

Question 5

nitrogen

phosphorus

potassium

both $$A$$ and $$B$$

Solution

Question 6

in beaker A, no change ; in beaker B, change to green

in beaker A, no change ; in beaker B, no change

in beaker A, changes to green ; in beaker B, no change

in beaker A, changes to green ; in beaker B, change to blue

Solution

Question 7

duralumin

bell metal

type metal

gun metal

Solution

Question 8

Copper hydroxide

Copper oxide

Copper sulphide

All of these

Solution

The metals, which are low in the reactive series, undergo reduction reaction. Their metal oxides react with carbon to reduce the metal oxide to its metal and form an oxide of carbon.

Question 9

Red to blue

Blue to red

No change on red litmus

Both $$B$$ and $$C$$

Solution

Question 10

Metals are good conductor of heat and electricity.

Non metals are good conductor of heat and electricity.

Metals are bad conductor of heat and electricity.

Both B and C

Solution

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