Metals and Non-metals Test

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Metals and Non-metals Test - 20

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Weekly Quiz Competition

Question 1
1 / -0

The method used for extracting metals, which are positioned towards the top of the activity series is known as _____.

A
oxidation

B
reduction

C
electrolytic reduction

D
electrolytic oxidation

Solution

The method used for extracting metals, which are positioned towards the top of the activity series is known as Electrolytic reduction. The reactivity of these metals are very high and cannot be reduced by using carbon.
Hence, the correct option is (C).
Question 2
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Which of the following metals is either found in a free state, or as its sulphide in the Earth`s crust?

A
Sodium

B
Calcium

C
Gold

D
Silver

Solution

Due to their low reactivity, both silver and gold are found in a free state or as its sulphide in the Earth`s crust
Hence, the correct options are (C) and (D).
Question 3
1 / -0

Which of the following metals has more affinity for oxygen than carbon?

A
Palladium

B
Bismuth

C
Aluminium

D
Zinc

Solution

Aluminium has more affinity for oxygen than carbon, due to which there reduction is not possible by carbon.
Hence, the correct option is (C).
Question 4
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What are the constituents of stainless steel?

A
Iron and carbon

B
Iron, nickel and chromium

C
Iron and nickel

D
Iron and chromium

Solution

Essential components of stainless steel are iron, nickel and chromium.
Hence, the correct option is (B).
Question 5
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Which of the following metals is often found in a free state in the Earth`s crust?

A
Magnesium

B
Aluminium

C
Gold

D
Lead

Solution

The metals at the bottom of the activity series are the least reactive. They are often found in a free state. For example, gold, silver, platinum and copper are found in the free state.
Hence, the correct option is (C).
Question 6
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Which of the following is the constituent of solder?

A
Cu, Sn

B
Ca, Sn

C
Sn, Zn

D
Pb, Sn

Solution

Solder is an alloy of tin and lead. It is a fusible metal alloy used to create a permanent bond between metal workpieces.
Hence, the correct option is (D).
Question 7
1 / -0

Which of the following is the strongest?

A
24-carat gold

B
22-carat gold

C
20-carat gold

D
18-carat gold

Solution

Among the above gold, 18 carat gold is strongest as it is mixed with other substances to increase its strength.
18 carat gold is made up of 75% gold and 25% alloy. This type of gold is referred to as 18 carat because 18 out of the 24 parts that make up the gold are pure gold.
Hence, the correct option is (D).
Question 8
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Ores of many metals are found in which of the following forms?

A
Sulphides

B
Oxides

C
Carbonates

D
Carbides

Solution

Ores are those minerals from which metals are extracted commercially and economically.
Ores of most metals are found in forms of oxide.
Hence, the correct option is (B).
Question 9
1 / -0

Which of the following metals is always present in an amalgam?

A
Mercury

B
Copper

C
Iron

D
Zinc

Solution

Mercury (Hg) forms an amalgam with other metals.
Hence, the correct option is (A).
Question 10
1 / -0

Which of the following series of steps correctly represents the extraction of metals of low reactivity from ores?

A
Ore Concentration of oreSulphide oreRoastingOxide of metal Auto-reduction Purification of metal

B
^{_Ore_{Concentration of ore}_{Oxide of metal}_{Sulphide ore}_Roasting_{Reduction of metal}_{Purification of metal}}

C
^{_Ore_{Concentration of ore}_{Oxide of metal}_{Carbonate ore}_{Sulphide ore}_{Reduction of metal}_{Purification of metal}}

D
Ore Concentration of ore Roasting Sulphide ore Oxide of metal Auto-reduction Purification of metal

Solution

The first step involves the extraction of metals of low reactivity is the concentration of ore which includes removal of the unwanted materials (e.g., sand, clays, etc.) from the ore. If the ore is sulphide ore then it is heated in a regular supply of air in a furnace at a temperature below the melting point of the metal. This process is known as roasting. The oxide obtains in this process is then reduced and purified to get pure metal.
Hence, the correct option is (A).