Q. 3 C
Justify that the following reactions are redox reactions:
4BCl3(g) + 3LiAlH4(s) → 2B2H6(g) + 3LiCl(s) + 3 AlCl3 (s)
Let us write the oxidation number of each element involved in the given reaction as:
In BCl3, B = + 3 and Cl = -1
In LiAlH4, Li = + 1, Al = + 3 and H = -1
In B2H6,B = -3 and H = + 1
In LiCl, Li = + 1 and Cl = -1
In AlCl3, Al = + 3 and Cl = -1
In this reaction, O.N. of B decreases from + 3 in BCl3 to -3 in B2H6 i.e. BCl3 is reduced to B2H6. Also, the O.N. of H increases from -1 in LiAlH4 to + 1 in B2H6 i.e. is LiAlH4 oxidised to B2H6.
Hence, the given reaction is a redox reaction.
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