Metals and Non-metals Test

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Metals and Non-metals Test - 31

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Weekly Quiz Competition

Question 1
1 / -0

In the refining of copper, pure copper is deposited at:

A
Anode

B
Cathode

C
A and B both

D
None of these

Solution

In the electrorefining of copper, the impure metal is made the anode and the pure metal made the cathode. On passing electric current, pure copper is deposited on the cathode.
Option B is correct.
Question 2
1 / -0

Which one of the following pairs of substances on reaction will not evolve $$H_{2}$$ gas?

A
Iron and $$H_{2}SO_{4}$$ (aq.)

B
Iron and steam

C
Copper and $$HCl$$ (aq.)

D
Sodium and ethanol

Solution

Metals generally react with acids to give metal salt and hydrogen gas. However, when testing copper with acids, it was found that no bubbles are produced and the temperature also remained unchanged. This shows that copper does not react with dilute HCl. So, hydrogen gas is also not evolved.
Question 3
1 / -0

Name a metal that does not react with dil. $$HCl$$ or $$H_2SO_4$$.

A
Copper

B
Silver

C
Gold

D
All of the above

Solution

Metals below hydrogen (copper, silver, gold and platinum), will not react with dilute acid. They cannot displace hydrogen from the non-metal anion.
Question 4
1 / -0

Compare the physical properties of metals and non-metals in general regarding malleability.

A
Both are malleable

B
None are malleable

C
Only metals are malleable

D
Only non-metals are malleable

Solution

Malleability is the property of metals by which they can be beaten into thin sheets. Metals can withstand hammering and can be made into thin sheets known as foils, while non-metals are generally brittle and non-malleable.
Question 5
1 / -0

On strong heating, zinc metal burns in presence of air to form :

A
zinc chloride

B
zinc sulphide

C
zinc oxide

D
zinc hydroxide

Solution

Zinc metal burns in air only on strong heating to form zinc oxide.

$$Zinc + Oxygen \xrightarrow{\Delta} Zinc\,oxide$$

$$2Zn + O_2 \xrightarrow{\Delta} 2ZnO$$
Question 6
1 / -0

Compare metals and non-metals with particular emphasis on solubility:

A
Both dissolve in solvent

B
None of them dissolve in solvent

C
Metal dissolve while non-metal do not dissolve in solvent

D
Non-metal dissolve while metal do not dissolve in solvent

Solution

Metals
They do not dissolve in solvents except by chemical action. Non-metals
They dissolve in solvents and can be re-obtained by evaporation. Example: sulphur in carbon disulphide.
Question 7
1 / -0

Which of the following is true for electrolytic refining?

A
Pure metal is anode and impure metal is cathode

B
Pure metal is cathode and impure metal is anode

C
Both are anode

D
Both are cathode

Solution

In electrolytic refining, the impure metal is made the anode. A strip of the same metal in pure form is used as a cathode.
Thus, option B is correct.
Question 8
1 / -0

On reaction with water, metal produces:

A
oxygen

B
nitric acid

C
base

D
metal oxide

E
none of the above

Solution

Metals react with water and produce a metal oxide and hydrogen gas. Metal oxides that are soluble in water dissolve in it to further form metal hydroxide. But all metals do not react with water.
Question 9
1 / -0

In the electrolytic refining of zinc,

A
graphite is at the anode.

B
the impure metal is at the cathode.

C
the metal ions get reduced at the anode.

D
acidified zinc sulphate is the electrolyte.

Solution

In the electrolytic refining of zinc:
Anode: Impure zinc
Cathode: Strip of pure zinc
Electrolyte: Acidified zinc sulphate solution

At the anode, oxidation of metal occurs.
$$Zn \longrightarrow Zn^{2+} + 2e^–$$
At the cathode, reduction of metal ions takes place.
$$Zn^{2+} + 2e^– \longrightarrow Zn$$
Question 10
1 / -0

Corrosion can not be prevented by which of the following method?

A
Galvanisation

B
Create a barrier between the object being corroded and oxygen

C
Painting

D
Exposing it to sunlight

Solution

Corrosion can be prevented by creating a barrier between the object and oxygen. Galvanisation is a process to prevent corrosion and so is painting. However, exposing to sunlight is not a method to prevent corrosion.
Thus, option $$D$$ is correct.

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Re-Attempt Weekly Quiz Competition

Metals and Non-metals Test - 31

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Metals and Non-metals Test - 31

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Question 1

Anode

Cathode

A and B both

None of these

Solution

Question 2

Iron and $$H_{2}SO_{4}$$ (aq.)

Iron and steam

Copper and $$HCl$$ (aq.)

Sodium and ethanol

Solution

Question 3

Copper

Silver

Gold

All of the above

Solution

Question 4

Both are malleable

None are malleable

Only metals are malleable

Only non-metals are malleable

Solution

Question 5

zinc chloride

zinc sulphide

zinc oxide

zinc hydroxide

Solution

Question 6

Both dissolve in solvent

None of them dissolve in solvent

Metal dissolve while non-metal do not dissolve in solvent

Non-metal dissolve while metal do not dissolve in solvent

Solution

Question 7

Pure metal is anode and impure metal is cathode

Pure metal is cathode and impure metal is anode

Both are anode

Both are cathode

Solution

Question 8

oxygen

nitric acid

base

metal oxide

none of the above

Solution

Question 9

graphite is at the anode.

the impure metal is at the cathode.

the metal ions get reduced at the anode.

acidified zinc sulphate is the electrolyte.

Solution

Question 10

Galvanisation

Create a barrier between the object being corroded and oxygen

Painting

Exposing it to sunlight

Solution

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