(I) H2O2+O3           H2O + 2O2

(II) H2O2 + Ag2O           2Ag + H2O + O2

Role of hydrogen peroxide in the above reactions is respectively

1. oxidising in (I) and reducing in (II)

2. reducing in (I) and oxidising in (II)

3. reducing in (I) and  (II)

4. oxidising in(I) and (II)

Subtopic:  H2O2 (Hydrogen Peroxide) |
From NCERT
NEET - 2014
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In acidic medium, H2O2 changes Cr2O72- to CrO5 which has two (-O-O-) bonds. Oxidation

state of Cr in CrO5 is

1. +5

2. +3

3. +6

4. -10

Subtopic:  Hydrogen- Types & Isotopes | H2O2 (Hydrogen Peroxide) |
 64%
NEET - 2014
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The ease of adsorption of the hydrated alkali metal ions on an ion-exchange resins

follows the order:

1. Li+<K+<Na+<Rb+

2. Rb+<K+<Na+<Li+

3. K+<Na+<Rb+<Li+

4. Na+<Li+<K+<Rb+

Subtopic:  Hard & Soft Water |
 65%
NEET - 2012
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The correct statement for the hydrogenation of oil is:

1. Hydrogen is dissolved in the oil
2. Hydrogen combines with O2 from the oil
3. Esters of unsaturated fatty acids are reduced to those of saturated acids
4. Hydrogen drives off impurities from the oil

Subtopic:  Hydrogen- Types & Isotopes |
 87%
From NCERT
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H2O2 restores the colour of old lead paintings by:

1. Converting PbO2 to Pb

2. Oxidising PbS to PbSO4

3. Converting PbCO3 to Pb

4. Oxidizing PbSO3 to PbSO4

Subtopic:  H2O2 (Hydrogen Peroxide) |
 74%
From NCERT
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Which conversion is not done by H2O2 ?

1. Fe2+         Fe3+(acidic medium)

2. PbS         PbSO4

3. Fe+         Fe3+ (alkaline medium)

4. KI         I2

Subtopic:  H2O2 (Hydrogen Peroxide) |
 60%
From NCERT
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Poorest reducing agent among following is

1. atomic hydrogen

2. nascent hydrogen

3. dihydrogen

4. all have same reducing strength

Subtopic:  Hydrogen- Types & Isotopes |
 51%
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In which reaction hydrogen is not formed ?

(1) Copper and hydrochloric acid

(2) Iron and sulphuric acid

(3) Magnesium and steam

(4) Sodium and alcohol

Subtopic:  Preparation & Properties |
 70%
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Maximum concentration of ortho-H2 in ordinary hydrogen is:

(1) 75% ortho-H2 + 25% para-H2

(2) 25% ortho-H2 + 75% para-H2

(3) 50% ortho-H2 + 50% para-H2

(4) 99% para-H2 + 1% ortho-H2

Subtopic:  H2O2 (Hydrogen Peroxide) |
 76%
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Hydrogen will not reduce-

(1) heated cupric oxide                                 

(2) heated ferric oxide

(3) heated stannic oxide                               

(4) heated aluminium oxide

Subtopic:  Preparation & Properties |
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