From the following flowsheet for the ext...

From the following flowsheet for the extraction of pure metal, answer the given questions.

(vi) following reaction is not involved in thermite process :
(a)3 `Mn_(3 )O_(4)+8Al→9Mn+4Al_(2)O_(3)`
(b) `Cr_(2)O_(3)+2Al→Al_(2)O_(3)+C r`
(c) `2Fe+Al_(2)O_(3)→2Al+Fe_(2)O _(3)`
(d) `B_(2)O_(3)+2Al→2B+Al_(2)O _(3)`

`3Mn_(3) O_(4) + 8 Al rarr 9 Mn + 4Al_(2) O_(3)`

`Cr_(2) O_(3) + 2 Al rarr Al_(2) O_(3) + 2Cr`

`2Fe + Al_(2) O_(3) rarr 2 Al + Fe_(2) O_(3)`

`B_(2) O_(3) + 2Al rarr 2B + Al_(2) O_(3)`

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