Metals and Non-metals Test

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Metals and Non-metals Test - 9

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Weekly Quiz Competition

Question 1
1 / -0

Cryolite is used in the electrolytic reduction of Alumina (Al₂O₃) to:

A
To slow down the reaction.

B
Decrease the melting point of Al₂O₃

C
Act as a flux to separate gangue.

D
All of these

Solution

The difficulty of separating aluminium from oxygen in the alumina is overcome by the use of cryolite as a flux to dissolve the oxide mineral. Pure cryolite melts at 1012 °C. It dissolves the aluminium oxides sufficiently well to allow easy extraction of the aluminium by electrolysis.
Question 2
1 / -0

Which of the following metal reacts neither with cold water nor with hot water but reacts with hot steam to produce hydrogen gas?

A
Na

B
Ca

C
Mg

D
Fe

Solution

Sodium reacts vigorously with water. Such is the reaction that it has to be stored under kerosene. Calcium can react with cold water. Magnesium reacts with hot water. Heated iron reacts with water when hot steam is passed over it.

3Fe (s) + 4H₂O (g) -> Fe₃O₄(s) + 4H₂(g)
Question 3
1 / -0

Fountain experiment demonstrates:

A
Solubility of SO₂ in water

B
Solubility of NH₃ in H₂O

C
Manufacturing of NH₃

D
None of these

Solution

The ammonia fountain demonstrates the solubility of ammonia in water.
Question 4
1 / -0

Statement A: All metals form basic oxides.

Statement B: Few non metals form neutral oxides.

A
Statement A is true. Statement B is false.

B
Statement B is true. Statement A is false.

C
Both the statements A and B are true.

D
Both the statements A and B are false.

Solution

Most metals form basic oxides. However, some metals like aluminium and zinc, are amphoteric and form basic as well as acidic oxides. Non-metals react with oxygen to form acidic oxides or neutral oxides. E.g. Hydrogen forms a neutral oxide - H₂O.
Question 5
1 / -0

An element belonging to 16th group of periodic table is used in the manufacturing of vulcanized rubber. This element reacts with hot and conc. HNO₃ to form sulphuric acid. The concerned element is:

A
Sulphur

B
Oxygen

C
Silicon

D
Germanium

Solution

The element is Sulphur. Sulphur is used to manufacture sulphuric acid and in the vulcanisation of rubber. S + 2HNO₃--> H₂SO₄ + 2NO
Question 6
1 / -0

Statement A: The electrical conductivity and melting point of an alloy is less than that of pure metals.

Statement B: Different metals have same reactivity with water and dilute acids.

A
Statement A is true; Statement B is false.

B
Statement B is true; Statement A is false.

C
Both the statements - A and B - are true.

D
Neither statement A nor statement B is true.

Solution

Alloys have lower electrical conductivity than that of pure metals. Alloys have lower melting points than that of the constituent metals. Different metals have different reactivity with water and dilute acids. Sodium and potassium react vigorously with cold water. Some metals like magnesium and calcium react with water to form metal hydroxide and hydrogen while some like aluminium and iron react with steam to form metal oxide and hydrogen. Metals usually displace hydrogen from dilute acids; some react only on heating. Metals like gold, silver and copper do not react with dilute acids at all.
Question 7
1 / -0

Sulphide ores are concentrated by:

A
Magnetic separation

B
Chemical separation

C
Froth floatation

D
Hydraulic washing

Solution

Sulphide ores are concentrated by froth floatation method. Collectors and froth stabilisers are added to a suspension of powdered ore in water. Light froth carrying mineral particles are skimmed off and then dried to recover ore particles.
Question 8
1 / -0

In the electrolytic refining of copper, the impure metal is made the:

A
Anode

B
Cathode

C
Can be ‘Anode’ or ‘Cathode’

D
None of these

Solution

In the electrolytic refining of copper, impure copper is made the anode. It is connected to the positive terminal of the battery. Pure copper metal is produced on the cathode. Impure anode becomes thinner; pure cathode becomes thicker.
Question 9
1 / -0

What happens when ammonia reacts with hydrogen chloride? NH₃+ HCl → ?

A
H₂ gas is evolved.

B
NH₄Cl is formed.

C
Cl₂ gas is evolved.

D
Both H₂ and NH₄Cl

Solution

Ammonium chloride is formed when ammonia reacts with hydrogen chloride. It is a combination reaction. NH₃(g) + HCl(g) → NH₄Cl(s)
Question 10
1 / -0

HNO₃ is a strong acid because:

A
It dissociates completely in aqueous solution.

B
It doesn’t dissociate into ions at all.

C
It dissociates partially in aqueous solution.

D
None of these

Solution

Nitric acid is a mineral acid. It is a strong acid because it dissociates completely in aqueous solution to form hydronium ions.

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Metals and Non-metals Test - 9

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Question 1

To slow down the reaction.

Decrease the melting point of Al2O3

Act as a flux to separate gangue.

All of these

Solution

Question 2

Na

Ca

Mg

Fe

Solution

Question 3

Solubility of SO2 in water

Solubility of NH3 in H2O

Manufacturing of NH3

None of these

Solution

Question 4

Statement A is true. Statement B is false.

Statement B is true. Statement A is false.

Both the statements A and B are true.

Both the statements A and B are false.

Solution

Question 5

Sulphur

Oxygen

Silicon

Germanium

Solution

Question 6

Statement A is true; Statement B is false.

Statement B is true; Statement A is false.

Both the statements - A and B - are true.

Neither statement A nor statement B is true.

Solution

Question 7

Magnetic separation

Chemical separation

Froth floatation

Hydraulic washing

Solution

Question 8

Anode

Cathode

Can be ‘Anode’ or ‘Cathode’

None of these

Solution

Question 9

H2 gas is evolved.

NH4Cl is formed.

Cl2 gas is evolved.

Both H2 and NH4Cl

Solution

Question 10

It dissociates completely in aqueous solution.

It doesn’t dissociate into ions at all.

It dissociates partially in aqueous solution.

None of these

Solution

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Decrease the melting point of Al₂O₃

Solubility of SO₂ in water

Solubility of NH₃ in H₂O

Manufacturing of NH₃

H₂ gas is evolved.

NH₄Cl is formed.

Cl₂ gas is evolved.

Both H₂ and NH₄Cl