Tag: occurrence of metals

Questions Related to occurrence of metals

Why do we need to separate different components of a mixture? Select the correct explanation from the following.

geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

  1. To remove the unwanted impurities

  2. To obtained pure substances

  3. To separate, two different but useful components

  4. All of these

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Correct Option: D
Explanation:

Mixtures have different physical and chemical properties compared with same metals. we need to separate different substances from mixtures as we want only useful substances and to obtain pure substances.

Matte contains mainly:

geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

  1. $FeS$

  2. ${Cu} _{2}S$

  3. ${Cu} _{2}S$ and $FeS$

  4. ${Cu} _{2}S$ and ${Fe} _{2}{S} _{3}$

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Correct Option: C
Explanation:

Matte contains mainly ${Cu} _{2}S$ and $FeS$. It also contains coke and sand. It is the molten metal obtained from the blast furnace.

Which element is present in Ruby as impurity?

geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

  1. $Cu$

  2. $Cr$

  3. $Au$

  4. $Zn$

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Correct Option: B
Explanation:

Chromium (Cr) metal is present in Ruby as an impurity. Ruby has pink to blood-red colour. It is a  gemstone. It is a variety of the mineral corundum (aluminium oxide).