NCERT Solutions For Class 12 Chemistry Chapter 6: General Principles and Processes of Isolation of Elements

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Jasmine Grover

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NCERT Solutions for Class 12 Chemistry Chapter 6 General Principles and Processes of Isolation of Elements focuses on the occurrence of ores, their concentration, and separation processes. Some of the important topics of General Principles and Processes of Isolation of Elements chapter include:

  1. Calcination and Roasting
  2. Concentration of Ore
  3. Zone Refining
  4. Reverberatory Furnace
  5. Ellingham Diagram

As this topic has been omitted from the new CBSE Class 12 Syllabus, no questions can be expected from this chapter. But I can be useful for other competitive exams.

Download PDF: NCERT Solutions for Class 12 Chemistry Chapter 6 pdf


NCERT Solutions for Class 12 Chemistry Chapter 6

The NCERT Solutions for Class 12 Chemistry Chapter 6 is as given below.

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Chapter 6 General Principles and Processes of Isolation of Elements –Important Topics

Metallurgy is the process of extracting pure metal from its ore for domestic and commercial purposes.

Crushing/ Grinding → Purification of Ore → Roasting/ Calcination → Reduction → Refining of Metal

The various methods of concentration of ore includes:

  • Hydraulic Washing
  • Froth Floatation
  • Magnetic Separation
  • Leeching

Calcination: Process of converting carbonate ores into metal oxides.

Roasting: Process of converting sulphide ores into metal oxides.

Reduction: It is the process of removing the oxygen of metal oxides to extract metal.

The various methods of refining includes:

  • Electrolytic refining
  • Distillation
  • Liquation
  • Zone refining
  • Vapour phasing
  • Chromatography

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CBSE CLASS XII Related Questions

  • 1.

    Match Column I with Column II and choose the correct option :

    Column IColumn II
    a. Osmotic pressurei. \( \Delta \mathrm{T_f} = \mathrm{K_f}\,m \)
    b. Elevation of boiling pointii. \( \pi = CRT \)
    c. Depression of freezing pointiii. \( \frac{\mathrm{P_1^0 - P_1}}{\mathrm{P_1^0}} = \frac{\mathrm{W_2 \times M_1}}{\mathrm{M_2 \times W_1}} \)
    d. Relative lowering of vapour pressureiv. \( \Delta \mathrm{T_b} = \mathrm{K_b}\,m \)

      • a-i, b-ii, c-iii, d-iv
      • a-ii, b-i, c-iii, d-iv
      • a-iv, b-iii, c-ii, d-i
      • a-ii, b-iv, c-i, d-iii

    • 2.

      (a) Define 'Denatured Protein' with an example.

      (b) What happens when glucose reacts with HCN ? Write the reaction involved.

      (c) Name the disease caused by the deficiency of Vitamin C.


        • 3.

          Write the reactions taking place at anode and cathode in a lead storage battery, when it is in use.


            • 4.

              Explain the Finkelstein reaction.


                • 5.

                  Conductivity of \( 2.5 \times 10^{-4} \) M methanoic acid solution is \( 5.25 \times 10^{-5} \) S cm\(^{-1}\).

                  (a) Calculate its molar conductivity.

                  (b) Calculate its degree of dissociation.

                  [Given : \( \lambda^{\circ}_{(\mathrm{H^+})} = 349.5 \) S cm\(^2\) mol\(^{-1}\) and \( \lambda^{\circ}_{(\mathrm{HCOO^-})} = 50.5 \) S cm\(^2\) mol\(^{-1}\)]


                    • 6.

                      Draw the structures of major monohalo products in each of the following :

                      (a)

                      (b)



                        CBSE CLASS XII Previous Year Papers

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