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Tempering of steel...

Tempering of steel

A

Increases mechanical strength

B

Changes ration of iron in steel

C

Involves heating the steel to appropriate temperature and then cooling it rapidly

D

Decreases mechanical strength

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The correct Answer is:
A, C
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CENGAGE CHEMISTRY ENGLISH-GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS-Exercise (Multiple Correct)
  1. In the electrolytic reduction of pure Al2O3. Fluorspar (CaF2) is added...

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  2. Which is correct process-mineral group in metallurgical extraction ?

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  3. Tempering of steel

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  4. Out of the following reduction processes : (i) Fe(2)O(3) + 3C rarr 2...

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  5. Which of the following metals cannot be obtained by electrolysis /

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  6. Silver containing lead as an impurity is not purified by

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  7. Select the correct statements for Ellingham diagram.

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  8. Which of the following statements is/are correct

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  9. Which of the following pairs consists of ore the same metal ?

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  10. Which of the following metal oxides are reduced by self-reduction meth...

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  11. Disadvantages of using carbon as a reducing agent :

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  12. Select the correct statements :

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  13. Froth flotation process used for the concentration of sulphide ore.

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  14. Which of the following steps are involved in hydrometallurgical proces...

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  15. The reduction of an oxide by aluminium is called as Roasting. True/Fal...

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  16. For the pyrometallurgical method used for the extraction of copper fro...

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  17. In Fe extraction, the roasting is carried out because

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  18. Select the correct statements (Ellingham diagram) :

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  19. Select the correct statements for Ellingham diagram.

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  20. The extraction of metals from sulphide ore involves

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