Question

The oxidation number of chromium in potassium dichromate
is [1995]
(a) + 6 (b) – 5
(c) – 2 (d) + 2

Answer 1

The oxidation number of chromium in potassium dichromate is +6

1) the formula of potassium dichromate is K2Cr2O7 which is bright red-orange ionic salt

2) oxidation number of Cr is

2×(1)+ 2×(Cr)+ 7(-2) = 0

2+2(Cr)-14=0

2(Cr)= +12

Cr=+6

3) So option (a) is correct

Answer 2

The oxidation number of chromium in potassium dichromate is +6.

Explanation:

• Potassium dichromate is a complex salt of potassium and dichromate ions.

• The dichromate ion contains 2 chromium ions and 7 oxygen ions.

• The charge of the chromium comes as +6.

• So the oxidation number of chromium is +6.

• oxidation number of Cr is 2×(1)+ 2×(Cr)+ 7(-2) = 0 2+2(Cr)-14=0 2(Cr)= +12 Cr=+6

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