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Which of the following metals are extrac...

Which of the following metals are extracted by using `Al` as reducing agent ?

A

`Na` from `Na_(2)O`

B

`Cr` from `Cr_(2)O_(3)`

C

`Mn` from `MnO_(2)`

D

`Fe` from `Fe_(2)O_(3)`

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The correct Answer is:
A
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Despite the fact that aluminium is a reactive metal, it is a stable in air as well as in water. This is due to the formation of thin layer of oxide on the surface of aluminium metal which makes it passive for further attack. The layer is so useful, that in industry, it is purposely deposited by an electrolytic process called anodising. Reaction of aluminium with oxygen is highly exothermic and is called thermite reaction. 2Al_((s)) +(3)/(2) O_(2(g)) rarr Al_(2)O_(3(s)) Delta_(f) H^(Ө) = -1670 kJmol^-1 This reaction finds application for welding of metal and in the metallurgical extraction of many metals from their oxides. The limitation is that to start the reaction, high temperature is required for which an ignition mixture is required. Which of the following metals cannot be extracted by using Al as a reducing agent ?

Which of the following is a reducing agent ?

Which of the following is a reducing agent?

Which of the following alkaline earth metals is the strongest reducing agent?

ALLEN-METALLURGY-EXERCISE-01
  1. Process of heating ore is air to remove sulphur is:

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  2. In which of the following reaction "Philocopher's wool" is formed

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  3. Which of the following metals are extracted by using Al as reducing ag...

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  4. The correct ste of carbonate ores is (a) Magnesite (b) Siderite (c) ...

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  5. Calcination is the process of heating the ore

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  6. Copper matte consists of:-

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  7. Which of the following statements is correct for roasting

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  8. Among the following statements, the incorrect one is

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  9. Fe can displace which of the following ions from their aqueous solutio...

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  10. There are following extraction process of silver but not:

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  11. Which of the following is not an ore:

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  12. In the Pidgeon process, Mg is produced by:

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  13. "Foo's gold" is

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  14. Which one of the following reactions is an example for calcination pro...

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  15. Identify the process to which the following reaction belongs AI(2) O...

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  16. (Ag +Pb) alloy overset("Melt and add zinc")rarr (Ag +Pb +Zn) "melt" ov...

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  17. Formation of metallic copper from sulphide ore in te normal thermometa...

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  18. Bessemerisation is carried out for (i) Fe (ii) Cu (iii) AI (iv) sil...

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  19. Consider the following statements: Roasting is carried out to: (i)...

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  20. For extraction of sodium from NaCI, the electrolytic mixture NaCI + Na...

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