QUESTION 3 What is the oxidation state of nitrogen before and after the reaction

Question

QUESTION 3

What is the oxidation state of nitrogen before and after the reaction below?

2NO3-(aq) + 8H+(aq) + 3Cu(s) 3Cu2+(aq) + 2NO(g) + 4H2O(l)

Before the reaction?

After the reaction?

+5

+4

+3

+2

+1

0

-1

-2

-3

-4

-5

      -       A.       B.       C.       D.       E.       F.       G.       H.       I.       J.       K.   

Before the reaction?

      -       A.       B.       C.       D.       E.       F.       G.       H.       I.       J.       K.   

After the reaction?

A.

+5

B.

+4

C.

+3

D.

+2

E.

+1

F.

0

G.

-1

H.

-2

I.

-3

J.

-4

K.

-5

Explanation / Answer

Before the reaction: Oxidation state of N = +5 (Answer: A)

NO3-

Among N and O, Oxygen is the most electronegative atom and it will have usual oxidation number -2.

x + (3 * -2) = -1 (overall charge of the system)

x + (-6) = -1

x = -1 +6 = +5

After the reaction: Oxidation state of N = +2 (Answer: D)

NO

Similarly, x + (-2) = 0

x = +2

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