Question

PEROXIDE

17. H2O2

is used but not as :-

(1) oxidant, reductant (2) bleaching agent

(3) antiseptic (4) catalyst

18. Which of the following is a true structure of H2O2

:-

(1)

H O O H

180°

(2) O O H

H

94°

(3) O O

H

H

(4) O O

H

H

19. In the reaction 2H2O2 ® 2H2O + O2

, oxidation

state of oxygen changes as :-

(1) Only – 1 to –2

(2) Only – 1 to zero

(3) Both of the above

(4) –1 to –3

EXERCISE-I (Conceptual Questions) ANSWER KEY

Que. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Ans. 2 4 1 4 2 1 4 1 3 4 2 1 3 2 4

Que. 16 17 18 19 20 21 22 23

Ans. 3 4 2 3 2 1 3 4

20. The dipole moment of H2O2

is 2.1D. This indi-

cates that the structure of H2O2

is :-

(1) Linear (2) Non-linear

(3) Symmetrical (4) None

21. Bleaching action of H2O2

is due to its :-

(1) Oxidising nature

(2) Reducing nature

(3) Acidic nature

(4) Thermal instability

22. Correct order of boiling point is :-

(1) H2

> H2O2

> D2O > H2O > D2

(2) H2O2

> H2

> D2O > H2O > D2

(3) H2O2

> D2O > H2O > D2 > H2

(4) H2O2

> D2O > H2O > H2 > D2

23. H2O < H2O2

order is incorrect for :-

(1) Boiling point (2) Acidic nature

(3) Dipole moment​

Answer 1

Answer:

peroxide is not used as antiseptic

Answer 2

Answer:

1) H2O2 is not used as the catalyst.

2) The true structure of H2O2 is 94.8°.

3) Correct option is c) Both of the above.

4) The structure of H2O2 is non-linear.

5) Bleaching of H202 is due to its oxidizing nature.

6) D2O has a higher boiling point than H2O2.

7) The correct option is 3) Dipole moment.

Explanation:

1) H2O2 is not used as the catalyst.

• Oxidising action - PbS(s) + 4H2O2 (aq) ⇒ PbSO4 (s) + 4H2O (l)
• Reducing action - HOCL + H2O2 ⇒ H3$O^{+}$$Cl^{-}$ + O2
• In daily life it is used as a hair bleach
• Hydrogen peroxide is used as an antiseptic under the name of perhydrol.

2) The true structure of H2O2 is 94.8°.

The structure of H2O2 is not planar, but it is an open book structure. The O-O-H , bond angle is 101.5 °, and the O-O single bond distance is 1.48°.

3) Correct option is c) Both of the above.

In H2O2 oxidation of O is -1

In H2O oxidation of O is -2 and in O2 oxidation of O is zero.

4) The structure of H2O2 is non-linear.

H2O2 is a non-planer molecule.

5) Bleaching of H202 is due to its oxidizing nature.

Due to the release of nascent oxygen it acts as a bleaching agent

6) D2O has a higher boiling point than H2O2.

D2O has a higher boiling point because its molecular weight is higher than H2O.

7) The correct option is 3) Dipole moment.

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