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NEET levelSingle correct optionDifficulty 1 of 3bn118

What is the oxidation number of Cr in $K X_{2} Cr X_{2} O X_{7}$ (O is $- 2$ , K is $+ 1$ )?

A $+ 6$
B $+ 7$
C $+ 3$
D $+ 12$

Answer: A

2 (+ 1) + 2 x + 7 (- 2) = 0

, so

2 x = 12

and

x = + 6

for each Cr.

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