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Which of the following change requires a reducing agent

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An Intiative by Sri Chaitanya

NH₃ $\to$ NF₃

Al(OH)₃ $\to$ Al(OH)₄^-

answer is B.

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Detailed Solution

1)\;\mathop {Cr}\limits^{ + 6} \mathop {O_4^{ - 2}}\limits^{ - 2} \; \to \;\mathop {Cr_2}\limits^{ + 6} \mathop {O_7^{ - 2}}\limits^{ - 2}

involves no Change in Ox.state

\large 2)\;\mathop {Br}\limits^{ + 5} O_3^ - \; \to \;\mathop {B{r^ - }}\limits^{ - 1}

is a reduction process it requires a reducing agent

\large \mathop {3)N}\limits^{ - 3} {H_3} \to \mathop {N{F_3}}\limits^{ + 3}

is an oxidation process
it requies an oxidizing agent

\large 4)\mathop {Al}\limits^{ + 3} {(OH)_3} \to {\left[ {\mathop {Al}\limits^{ + 3} {{(OH)}_4}} \right]^ - }

is not a redox reaction
Thus the process

requires a reducing agent

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