JEE Main · 2024 · 31 Jan 2024 · Shift 2 · d and f Block Elements

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

Answer: 6

Solution

Heating potassium dichromate with KCl and concentrated

H_{2} S O_{4}

is the chromyl chloride test:

K_{2} C r_{2} O_{7} + 4KCl + 6 H_{2} S O_{4} (conc.) \to 2Cr O_{2} C l_{2} ↑ + 6KHS O_{4} + 3 H_{2} O

In the product, chromyl chloride

Cr O_{2} C l_{2}

(a red-brown volatile liquid): with O at −2 and Cl at −1,

x + 2 (- 2) + 2 (- 1) = 0 \Rightarrow x = + 6

JEE Main · 2024 · 31 Jan 2024 · Shift 2 · Integer answer

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