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Question

Which of following reaction is not an example of thermite reaction?

A
Cr2O3+2AlAl2O3+2Cr
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B
3Mn3O4+8Al4Al2O3+9Mn
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C
2HgO+HgS3Hg+SO2
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D
2Cu2S+3O22Cu2O+2SO2
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Solution

The correct options are
C 2HgO+HgS3Hg+SO2
D 2Cu2S+3O22Cu2O+2SO2
Thermite process is the reduction of metal oxides with aluminum powder in which a huge amount of heat is liberated is called thermite process.

Thermite process is very useful for the welding of broken metal parts. When Aluminum powder reacts with iron oxide or chromium oxide and manganous oxide, a large amount of heat is released and about a temperature of 3500oC is attained which is enough to weld broken metallic parts.
So options A,B are thermite reactions.
Hence options C & D are correct

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