Metals and Non-metals Test

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Metals and Non-metals Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

The Iron pillar near the Qutub Minar in Delhi is prevented from rusting because of:

A
Formation of Fe₂O₃ on the surface.

B
Formation of Al₂O₃ on the surface.

C
Formation of Fe₃O₄ on the surface.

D
None of these

Solution

The Iron pillar near the Qutub Minar in Delhi is prevented from rusting because of the formation of magnetic oxide of iron (Fe₃O₄) on the surface. It is also painted with a mixture of different salts.
Question 2
1 / -0

The ratio of HCl and HNO₃ in Aqua Regia is:

A
1 : 3

B
3 : 2

C
2 : 3

D
3 : 1

Solution

The ratio of HCl and HNO₃ in Aqua Regia is 3 : 1. Aqua regia is a yellow-orange fuming liquid, so named by alchemists because it can dissolve the noble metals - gold and platinum.
Question 3
1 / -0

The group of metals which do not react with oxygen:

A
Na, Cs

B
Au, Ag

C
Pt, Cu

D
All of these

Solution

Gold and Silver do not react with oxygen. They are less reactive metals and lie at the bottom of the reactivity series.
Question 4
1 / -0

Which one of the following is not a method for enrichment of an ore?

A
Froth floatation

B
Electromagnetic separation

C
Roasting and Calcination

D
Hydraulic washing

Solution

Roasting and Calcination are used for conversion of ore to metal oxide. Hydraulic washing, Froth floatation and Electromagnetic separation are used for concentration, dressing or benefaction of an ore.
Question 5
1 / -0

Roasting is a method of heating ore:

A
In the presence of air.

B
In the presence of water.

C
In the absence of air.

D
In the absence of water.

Solution

Roasting is heating of an ore in a regular supply of air in a furnace.
Question 6
1 / -0

Which of the following is incorrect about H₂SO₄?

A
It is non-corrosive in nature.

B
It is a bad conductor of heat and electricity.

C
It is insoluble in H₂O

D
All the options

Solution

Sulphuric acid (H₂SO₄) is corrosive in nature and can severely damage tissues upon contact. It is a moderately strong oxidizing agent. It is also a powerful dehydrating agent and is used to remove a molecule of water from many organic compounds. It is soluble in water. All acids contain H⁺(aq) ions in solution. Hence, dilute acids conduct electricity. Sulphuric acid is commonly used as an electrolyte in lead-acid batteries.
Question 7
1 / -0

Magnesium imparts:

A
Brick red colour flame

B
Yellowish orange colour flame

C
Dazzling white colour flame

D
None of these

Solution

Magnesium burns in air with a dazzling white flame.
Question 8
1 / -0

Which of the following is not a silvery white metal?

A
Sn

B
Pb

C
Ag

D
Al

Solution

Freshly cut solid lead has a bluish-white color that soon tarnishes to a dull greyish color when exposed to air.
Question 9
1 / -0

The process of extracting a metal from its ore is called:

A
Refining

B
Metallurgy

C
Enrichment

D
Reduction

Solution

The scientific and technological process used for the isolation of metal from its ore is known as metallurgy.

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Metals and Non-metals Test - 8

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Metals and Non-metals Test - 8

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Question 1

Formation of Fe2O3 on the surface.

Formation of Al2O3 on the surface.

Formation of Fe3O4 on the surface.

None of these

Solution

Question 2

1 : 3

3 : 2

2 : 3

3 : 1

Solution

Question 3

Na, Cs

Au, Ag

Pt, Cu

All of these

Solution

Question 4

Froth floatation

Electromagnetic separation

Roasting and Calcination

Hydraulic washing

Solution

Question 5

In the presence of air.

In the presence of water.

In the absence of air.

In the absence of water.

Solution

Question 6

It is non-corrosive in nature.

It is a bad conductor of heat and electricity.

It is insoluble in H2O

All the options

Solution

Question 7

Brick red colour flame

Yellowish orange colour flame

Dazzling white colour flame

None of these

Solution

Question 8

Sn

Pb

Ag

Al

Solution

Question 9

Refining

Metallurgy

Enrichment

Reduction

Solution

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Formation of Fe₂O₃ on the surface.

Formation of Al₂O₃ on the surface.

Formation of Fe₃O₄ on the surface.

It is insoluble in H₂O