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Nature of Reactant and Rate of Reaction

What is the o...

Question

What is the oxidation number of $C r$ in $N a_{2} C r_{2} O_{7}$ ?

A

6

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B

2

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C

16

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D

10

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Solution

The correct option is A 6
Oxidation state of Na is +1 and oxygen is -2.
Thus,
$2 \times (+ 1) + 2 \times (x) + 7 \times (- 2) = 0 2 + 2 x - 14 = 0 2 x - 12 = 0 x = + 6$

Hence, option (b) is correct.

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