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Question

Justify that the following reactions are redox reactions.

A
CuO(s)+H2(g)Cu(s)+H2O(g)
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B
Fe2O3(s)+3CO(g)2Fe(s)+3CO2(g)
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C
4BCl3(g)+3LiAlH4(s)2B2H6(s)+3LiCl(s)+3AlCl3(s)
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D
2K(s)+F2(g)2K+F(s)
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Solution

The correct option is D 2K(s)+F2(g)2K+F(s)
(A) +2CuO(s)+0H2(g)0Cu(s)++1H2O(g)
Here, reduction of +2CuO to 0Cu and oxidation of 0H2 to +1H2O takes place. Therefore, it is a redox reaction.
(B) +3Fe2O3(s)+3+2CO(g)20Fe(s)+3+4CO2(g)
Here, reduction of +3Fe2O3 to 0Fe and oxidation of +2CO takes place. Therefore, it is a redox reaction.
(C) 4+3BCl3(g)+3Li+3AIH4(s)3+3B2H6(s)+3LiCl(s)+3+3AICl3(s)
Here, no change of oxidation states take place. Therefore, it is not a redox reaction.
(D) 20K(s)+0F2(g)2K+F(s)
Here, 0K is oxidized to K+1 and 0F2 is reduced to F1. So, it is a redox reaction.

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