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Q.

Acidified potassium dichromate reacts with potassium iodide and oxidizes it to I 2 . What is


the oxidation state of chromium in the products of the reaction?


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a

+4

b

+6

c

+3

d

+2 

answer is C.

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Detailed Solution

Concept: Oxidation number or state of an element in a molecule is the charge present per atom of that element after all others are removed. In an oxidation reaction, the oxidation state of an element increases.
To answer this question we must know the molecular formula of Cr the product. The chemical reaction of potassium dichromate with potassium iodide can be given as follows;
Question ImageThe oxidation state of Cr in C r 2 (S O 4 ) 3 can be calculated. C r 2 (S O 4 ) 3 is a neutral molecule. Thus total charge will be zero. The oxidation state of sulfate ion as a whole is −2 . Consider the oxidation state of Cr to be ‘x’. Then;
2x+[3×(−2)]=0 2x−6=0 2x=6 x=+3
Thus the answer is +3.
Hence, the correct answer is option 3.
 
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