Chemistry Quiz 3 | Oxidation Number

Chemistry quiz-3 contains 10 questions on oxidation-reduction reaction and oxidation number of periodic table elements for different types of competitive exams.

1 / 10

The +3 oxidation state of sulfur is present in

dithionous acid (H2S2O4)

sulfurous acid (H2SO3)

dithionic acid (H2S2O6)

pyrosulfuric acid (H2S2O7)

2 / 10

In SO₂ +2H₂S → 3S +2H₂O, the substance that is oxidized

SO2

H2O

S

H2S

3 / 10

The oxidation state of cobalt in [Co(NH₃)]Cl₃ is

+2

+4

+3

+5

4 / 10

The value of x in KAl(SO₄)_x, 12H₂O is

1

2

3

4

5 / 10

The number of electrons required to reduce chromium completely in Cr₂O₇^-2 to Cr⁺³ in an acidic medium is

5

3

6

2

6 / 10

The oxidation numbers of nitrogen in NH₄NO₃

-3, +6

+4, -5

-3, +5

-4, -6

7 / 10

The oxidation number of oxygen in the OF₂ compound is

-2

-1

+1

+2

8 / 10

What is the oxidation state of hydrogen in calcium hydride

+1

+2

-1

-2

9 / 10

The oxidation number of sulfur is -2 in

SO2

CS2

Na2SO4

Na2SO3

10 / 10

The oxidation state of the P atom in POCl₃ is

+5

+2

-5

+4

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