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NEET levelSingle correct optionDifficulty 1 of 3bn171

What is the oxidation number of Cr in $K X_{2} Cr X_{2} O X_{7}$ ?

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

Answer: C

K is +1 and O is

- 2

:

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

, so

x = + 6

.

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