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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 metal can be extracted without using reducing agent?

Which of the following metals is not extracted by leaching ?

Which of the followed metals can be extracted by using carbon reduction method, roasting followed by electrolysis and pyrometallurgy (self reduction) ?

Which of the following metals is extracted using silica lined convertor ?

Which of the following metal is extracted by using coke and carbon monoxide as reducing agent?

Which of the following metals cannot be extracted by the smelting process ? Al, Zn, Fe and Pb .

Which of the following acts as an oxidising as well as reducing agent ?

How many of the following metals can be extracted by auto - reduction ? Fe, Zn, Pb, Al, Hg, Cu, K, Ca

ALLEN-METALLURGY-EXERCISE-01
  1. Heating pyrites to remove sulphur is called

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  2. Write the reaction in which "Philosopher'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 strongly in the of air.

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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. Fool'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 Al(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 : 1...

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

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