Redox Reactions Ques 2

2. The oxidation number of chromium in potassium dichromate is

[1988, 1995]

(a) $+6$

(b) $-5$

(c) $-2$

(d) $+2$

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Answer:

Correct Answer: 2.(a)

Solution:

  1. (a) Let $x=$ oxidation no. of $Cr$ in $K_2 Cr_2 O_7$.

$\therefore(2 \times 1)+(2 \times x)+7(-2)=0$

or $2+2 x-14=0$ or $x=+6$.