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Which of the following reactions occurs ...

Which of the following reactions occurs during calcination ?

A

`CaCO_(3) rarr CaO + CO_(2)`

B

`2Al(OH)_(3) rarr Al_(2)O_(3) + 3H_(2)O`

C

`4FeS_(2) + 11 O_(2) rarr 2Fe_(2)O_(3) + 8SO_(2)`

D

`Cu_(2)S + 2CuO rarr 4Cu + SO_(2)`

Text Solution

Verified by Experts

The correct Answer is:
A, B
Reaction `(a)` and `(b)` represent calcination process, whereas `( c)` is roasting as reduction is done by heating in presence of `O_(2)` and `(d)` is auto-reduction process.
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CENGAGE CHEMISTRY-GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS-Exercise (Multiple Correct)
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  2. Auto-reduction process is used for the extraction of :

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  3. Which of the following reactions occurs during calcination ?

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  4. Leaching can be used for extraction of

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  5. MgO can be used as a refractory material because

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  6. Salt which is (are) least likely to find in minerals

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  7. The etraction of metals from oxide ores involves

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  8. According to Ellingham diagram the oxidation reaction of carbon and ca...

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  9. Which of the following statements are correct regarding metallurgy of ...

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  10. The major role of flourspar, CaF(2) which is added in small amount in ...

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

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  12. Tempering of steel

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

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  14. Out of the following matals that cannot be obtained by electrolysis of...

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

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  16. Select the correct statements for Ellingham diagram.

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  17. Which of the following statements is/are correct ?

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

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

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  20. Disadvantages of using carbon as a reducing agent :

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