Test: Metallurgy

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Description

This mock test of Test: Metallurgy for Class 10 helps you for every Class 10 entrance exam. This contains 5 Multiple Choice Questions for Class 10 Test: Metallurgy (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: Metallurgy quiz give you a good mix of easy questions and tough questions. Class 10 students definitely take this Test: Metallurgy exercise for a better result in the exam. You can find other Test: Metallurgy extra questions, long questions & short questions for Class 10 on EduRev as well by searching above.

QUESTION: 1

Metals can be obtained from metal oxide by ______ of metal oxide.

A.
Dissociation
B.
Disproportionation
C.
Oxidation
D.
Reduction

Solution: Because metal oxide is reduced to metal if oxide is removed by reduction. So it is reduction.

QUESTION: 2

Zinc oxide is reduced to Metallic Zinc by:

A.
Heating alone
B.
Heating with Oxygen
C.
Heating with carbon
D.
Hating with sulphur

Solution:

Reduction of an oxide by a substance depends on reducing ability of the substance. As Carbon(C) is more reductive than chromium oxide(Cr₂O₃), it has more affinity towards oxygen. Therefore, zinc oxide can reduced to metal by heating with carbon but not chromium oxide.

QUESTION: 3

Which one of these metals can be extracted from its molten ore only through electrolysis?

A.
Potassium
B.
Lead
C.
Gold
D.
Silver

Solution:

The oxides of potassium is of highly reactive metalware very stable and cannot be reduced by the most common reducing agent like carbon to obtain free metals. this is because these metals have more affinity for oxygen than carbon. so carbon is unable to remove oxygen from these metals. during electrolysis, the negatively charged electrode acts as a powerful reducing agent by supplying electrons to reduce the metal ions into metal.

QUESTION: 4

In Brinell hardness testing the timer for loading is

A.
1 second
B.
2 seconds
C.
5 seconds
D.
15 seconds

Solution:

QUESTION: 5

The metals low in the activity series can be extracted only by heating from their:

A.
Oxides
B.
Carbides
C.
Nitrides
D.
Sulphides

Solution:

Metals that are low in the activity series are very un-reactive. The oxides of these metals can be reduced to metals by heating alone. For example, mercury is obtained from its ore, cinnabar (HgS), by the process of heating.