important three mark questions

12th Standard EM

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Chemistry

Do not write anything on the question paper
Time : 00:30:00 Hrs
Total Marks : 30

    Part - A

    Answer all questions

    10 x 3 = 30
  1. Write the molecular composition of the following ores and mentions it metal : magnetite) calamine and bauxite.

  2. (i) Which of the following metals cannot: be extracted by the smelting process : 1 AI, Zn, Fe and Pb. Give reasons.
    (ii) Which one is a good reducing agent (C or CO) for Fe2O3, below 1073 k?

  3. What is coupling of reaction? How is it useful in metallurgy?

  4. Explain how the metal oxide is converted into metal using carbon as a reducing agent.

  5. How oxides of metals are reduced by hydrogen?

  6. What is meant by aluminotherrnitc process?

  7. What is auto-reduction?

  8. What is liquation?

  9. Mention the uses of copper

  10. List the applications of gold

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