Start learning →

Tamil Nadu HSC (Class 12) — free MCQ practice

Choose from 161 questions across 4 subjects and 10 topics. Open any question for its answer and worked solution, or keep learning through bite-sized lessons and reviews with Quill.

Start learning Tamil Nadu HSC (Class 12) with Quill →

Tamil Nadu HSC (Class 12) subjects

Accountancy (62)Physics (49)Chemistry (25)Economics (25)

Explore popular topics

ElectrostaticsMetallurgyAccounts from Incomplete RecordsAccounts of Partnership Firms - FundamentalsAccounts of Not-for-Profit OrganisationElectromagnetismEquipotential SurfacesStatic ElectricityNational IncomeIntroduction to Macro Economics

Try a Tamil Nadu HSC (Class 12) question

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
Show answer and solution

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_

Open this question →

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. $Na_3AlF_6$
Show answer and solution

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_

Open this question →

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

  1. flux
  2. slag
  3. gangue
  4. matte
Show answer and solution

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_

Open this question →

How to practise

  1. Choose a Tamil Nadu HSC (Class 12) question and try to work out your answer.
  2. Open the question to check the correct answer and read its worked solution.
  3. Continue in the app for bite-sized lessons, explanations and review with Quill. You can start without creating an account.