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Tamil Nadu HSC (Class 12) Chemistry — practice by topic

Browse 25 questions across 1 Chemistry topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Chemistry topics

Metallurgy (25)

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A naturally occurring substance from which a metal can be extracted profitably and economically is calledRead the answer and worked solution →The composition of the aluminium ore bauxite isRead the answer and worked solution →The rocky and siliceous non-metallic impurities associated with an ore are collectively calledRead the answer and worked solution →Froth flotation is the method of choice for concentratingRead the answer and worked solution →

Worked practice questions

A naturally occurring substance from which a metal can be extracted profitably and economically is called

  1. an ore
  2. a mineral
  3. a flux
  4. a slag
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Correct answer: A. an ore

1. A **mineral** is any naturally occurring substance containing a metal (free or combined). 2. Only those minerals from which the metal can be extracted **conveniently and economically** are called **ores**. 3. Hence every ore is a mineral, but every mineral is not an ore (e.g. bauxite is an ore of Al, china clay is not). _Source: Samacheer Kalvi Class 12 Chemistry Vol.1, Unit 1 'Metallurgy', §1.1.1_

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The composition of the aluminium ore bauxite is

  1. $Fe_2O_3 \cdot 2H_2O$
  2. $Al_2O_3 \cdot nH_2O$
  3. $Al_2O_3 \cdot SiO_2$
  4. $Na_3AlF_6$
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Correct answer: B. $Al_2O_3 \cdot nH_2O$

1. Bauxite is a hydrated oxide ore of aluminium. 2. Its formula is $Al_2O_3 \cdot nH_2O$ (hydrated alumina). 3. $Na_3AlF_6$ is cryolite (an additive in electrolysis), not the ore. _Source: Samacheer Kalvi Class 12 Chemistry Vol.1, Unit 1 'Metallurgy', Evaluation Q.1_

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The rocky and siliceous non-metallic impurities associated with an ore are collectively called

  1. flux
  2. slag
  3. gangue
  4. matte
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Correct answer: C. gangue

1. Ores are mixed with earthy, rocky and siliceous impurities. 2. These undesired impurities are collectively called **gangue** (or matrix). 3. A **flux** later combines with the gangue to form a fusible **slag**; **matte** is a mixture of $Cu_2S$/$FeS$. _Source: Samacheer Kalvi Class 12 Chemistry Vol.1, Unit 1 'Metallurgy', §1.2_

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