Question

e. Calculate the oxidation
culate the oxidation number of
underlined atoms.
1. H2so4
2. HNO3
3. H3PO3
4. K2C2O4
5. H2S4O6
6. Cr2O7
7. NaH2pO7
​

Answer 1

Question :

Calculate the oxidation  calculate the oxidation number of  underlined atoms.

1. H2SO4  

2. HNO3

3. H3PO3

4. K2C2O4

5. H2S4O6

6. Cr2O7

7. NaH2PO7

Answer:

1 .

Let oxidation number of S in H2SO4  is p

2 + p - 8 = 0

p = + 6

2 .

Let oxidation number of N in HNO3 is q

1 + q - 6 = 0

q = + 5

3 .

Let oxidation number of  P  in H3PO3 is r

3 + r - 6 = 0

r = + 3

4 .

Let oxidation number of C in K2C2O4 is s .

2 + 2 s - 12 = 0

2 s = + 10

s = + 5

5 .

Let oxidation number of S in H2S4O6 is t

2 + 4 t - 12 = 0

4 t = + 10

t = 5 / 2

It is average of oxidation number of S in H2S4O6 .

6 .

Let oxidation number of Cr in  Cr2O7 is x

2 x - 14 = 0

x = 7

7 .

Let oxidation number of P in  NaH2PO7 is y .

1 + 2 + y - 14 = 0

y = + 14 - 3

y = + 11 ( incorrect )

Since oxidation number of P is maximum 5 .

So , oxidation number of P is + 5  here .

Answer 2

Answer:

1 + 6

2 + 5

4 + 4

5 + 6

6 A.V.

7 + 5

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