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Redox Reactions question

2024 · 31 Jan · Shift 2 · Q24

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Redox Reactions
2024 · 31 Jan · Shift 2 · Q24

Redox Reactions question

2024 · 31 Jan · Shift 2 · Q24

JEE MainChemistryRedox ReactionsNumerical+4 / −1

In the reaction of potassium dichromate, potassium chloride and sulfuric acid (conc.), the oxidation state of the chromium in the product is

(+)\underline{\hspace{2cm}}

.

Numerical answer

View written solutionFree

Correct answer: 6

Identify the reaction

Potassium dichromate reacts with potassium chloride and concentrated sulfuric acid to form chromyl chloride:

K_2Cr_2O_7 + 4KCl + 6H_2SO_4 \rightarrow 2CrO_2Cl_2 + 6KHSO_4 + 3H_2O

So, the chromium-containing product is chromyl chloride, $CrO_2Cl_2$ .

Find oxidation state of chromium in $CrO_2Cl_2$

Let the oxidation state of chromium be $x$ .

Oxygen usually has oxidation state $-2$
Chlorine in chlorides has oxidation state $-1$

Since the molecule is neutral:

x + 2(-2) + 2(-1) = 0

x - 4 - 2 = 0

x - 6 = 0

x = +6

Final answer

The oxidation state of chromium in the product is:

\boxed{6}

Comparison with stored correct answer

Stored correct answer = $6$

Derived answer = $6$

Hence, the derived answer agrees with the stored correct answer.

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