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Maharashtra State BoardSSC (English Medium) 10th Standard

Mercury, silver, gold are highly reactive metals.

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Question

Mercury, silver, gold are highly reactive metals.

Options

  • Right

  • Wrong

MCQ
True or False
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Solution

Mercury, silver, gold are highly reactive metals- Wrong

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Chapter 8: Metallugy - Right or Wrong sentence

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On the basis of reactivity metals are grouped into three categories: 

  1. Metals of low reactivity
  2. Metals of medium reactivity
  3. Metals of high reactivity

Therefore metals are extracted in pure form from their ores on the basis of their chemical properties.

Metals of high reactivity are extracted from their ores by electrolysis of the molten ore.

Metals of low reactivity are extracted from their sulphide ores, which are converted into their oxides. The oxides of these metals are reduced to metals by simple heating.

(a) Name the process of reduction used for a metal that gives vigorous reaction with air and water both.

(b) Carbon cannot be used as a reducing agent to obtain aluminium from its oxide? Why?

(c) Describe briefly the method to obtain mercury from cinnabar. Write the chemical equation for the reactions involved in the process.

                                     OR

(c) Differentiate between roasting and calcination giving chemical equation for each. 


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