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More active metals are not obtained from...

More active metals are not obtained from their ores by simple reduction. This is because

A

`1`. More active metals are strong reducing agents

B

`2`. Temperature required for reduction is high

C

`3`. More expensive

D

`4`. All the above

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VGS PUBLICATION-BRILLIANT-PRINCIPLES OF METALLURGY-EXERCISE
  1. Which of the pairs of ores are carbonate ores ?

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  2. Method of extraction of metal from purified ore depends on

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  3. More active metals are not obtained from their ores by simple reductio...

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  4. ‘Na' metal is prepared from fused NaCl by

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  5. Which combination is wrong for the extraction of sodium metal from fus...

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  6. Which of the following step is not involved in the extraction of Ag ?

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  7. Which of the following impurities are present in a metal after reducti...

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  8. The selection of process of purification of a metal depends on:

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  9. Liquation is used for purification of metal if:

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  10. Chemically rust is a

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  11. When an Iron object is painted, the process of corrosion is reduced du...

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  12. The furnaces in which there is no direct contact between the hearth an...

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  13. Active metals are not extracted by the electrolysis or aqueous electro...

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  14. Which of the following is wrong?

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  15. Which of the following is correct about calcination ?

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  16. Which of the following is true about preparation of Iron by smelting p...

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  17. Which of the following is true about the electrolytic refining of meta...

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  18. Aluminium is more reactive than Iron, but rate of corrosion in Iron is...

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  19. Which of the following method is used for purification of metals conta...

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  20. The electrolyte used in refinery of copper is

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