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Which of the following reactions of Al i...

Which of the following reactions of `Al` is known as the thermite reaction?

A

Reaction with `N_(2)`

B

Reaction with `O_(2)`

C

Reaction with `NH_(3)`

D

Reaction with `NaOH`

Text Solution

Verified by Experts

The correct Answer is:
B
In thermite reaction, `Al` burns readily in air or oxygen. The rection is strongly exothermic:
`2Al(s) + (3)/(2) O_(2)(g) rarr Al_(2)O_(3) + "Energy", Delta_(T)H^(@)`
`= -1670 kJ mol^(-1)`
It evolves so much heat energy that it can be dangerous as the `Al` becomes white hot and often causes fire. The very strong affinity of `Al` for oxygen is used in the metallurgical extraction of other metals from their oxides:
`8Al + 3Mn_(3)O_(4) rarr 4Al_(2)O_(3) + 9Mn`
`2Al + Cr_(2)O_(3) rarr Al_(2)O_(3) + 2Cr`
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