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Despite the fact that aluminium is a rea...

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 ?

A

`W` from `WO_(3)`

B

`Mn` from `Mn_(3)O_(4)`

C

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

D

`Na` from `Na_(2)O`

Text Solution

Verified by Experts

The correct Answer is:
D
Since `Na` is more electropositive than `Al, Al` cannot displace `Na` from its oxide.
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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. Anodised aluminium is.

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. Aluminium becomes passive in :

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. Thermite mixture used for welding is

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. The reaction which is not involved in thermite process is

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. Anodising can be done by elecrolysing dil H_(2)SO_(4) with Al as anode. This results in :

Aluminium is not used to make :

Aluminium is a noble metal. State true or false .

The correct formula of aluminium oxide is

In the electrolytic extraction of aluminium, cryolite is used.

Assertion : Although aluminium is above hydrogen in electrochemical series, it is stable in air and water. Reason : The thin protective layer of oxide (AI_(2) O_(3)) on the surface protects the aluminium.

CENGAGE CHEMISTRY ENGLISH-P-BLOCK GROUP 13 - BORON FAMILY-Exercise (Linked Comprehension)
  1. Which of the following statement is wrong ?

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  2. The heavier members of 13 and 14 groups besides the group oxidation ...

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  3. Despite the fact that aluminium is a reactive metal, it is a stable in...

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  4. Despite the fact that aluminium is a reactive metal, it is a stable in...

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  5. Despite the fact that aluminium is a reactive metal, it is a stable in...

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  6. Despite the fact that aluminium is a reactive metal, it is a stable in...

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  7. Despite the fact that aluminium is a reactive metal, it is a stable in...

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  8. Despite the fact that aluminium is a reactive metal, it is a stable in...

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  9. "Colemanite" + Na(2)CO(3) overset("Fused")rarr (A) + (B) + CO(2) und...

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  10. "Colemanite" + Na(2)CO(3) overset("Fused")rarr (A) + (B) + CO(2) und...

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  11. "Colemanite" + Na(2)CO(3) overset("Fused")rarr (A) + (B) + CO(2) und...

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  12. "Colemanite" + Na(2)CO(3) overset("Fused")rarr (A) + (B) + CO(2) und...

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  13. "Colemanite" + Na(2)CO(3) overset("Fused")rarr (A) + (B) + CO(2) und...

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  14. "Colemanite" + Na(2)CO(3) overset("Fused")rarr (A) + (B) + CO(2) und...

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  15. "Colemanite" + Na(2)CO(3) overset("Fused")rarr (A) + (B) + CO(2) und...

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  16. Boron with hydrogen forms a number of hydrides which are known are b...

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  17. Boron with hydrogen forms a number of hydrides which are known are bor...

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  18. Boron with hydrogen forms a number of hydrides which are known are b...

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  19. Boron with hydrogen forms a number of hydrides which are known are bor...

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  20. Boron with hydrogen forms a number of hydrides which are known are b...

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