Test: Metallurgy

5 Questions MCQ Test Science Class 10 | Test: Metallurgy

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

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

Zinc oxide is reduced to Metallic Zinc by:


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.


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


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.


In Brinell hardness testing the timer for loading is


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


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.

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