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Justify that the following reactions are...

Justify that the following reactions are redox reactions :
`4BCl_(3)(g)+3LiAlH_(4)(s)to2B_(2)H_(6)(g)+3LiCl(s)+3AlCl_(3)(s)`

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`overset(+3)(4B) overset(-1)(Cl)_(3(g)) + overset(+1)(3Li) overset(+3)(Al)overset(-1)(H_(4))(s) rarr 2 overset(-3)(B_(2)) overset(+1)(H_(6)) (g) + 3 overset(+1)(Li) overset(-1)(Cl)(s) + 3 overset(+3)(Al) overset(-1)(Cl_(3))(s)`
In this reaction, the oxidation state of B is decreasing from +3 (in BCl) to -3 (in `B_(2)H_(6)`) hence `BCl_(3)` is undergoing reduction. While the oxidation number of hydrogen is increasing from `-1` (in `LiAlH_(4)`) to +1 (in `B_(2)H_(6)`), hence, `LiAlH_(4)` is undergoing oxidation. Therefore, it is a redox reaction.
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