(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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An incorrect statement among the following regarding hydrogen is:
 

1. Hydrogen never acts as a cation in ionic salts.
2. Hydronium ion, H3O+ exists freely in a solution.
3. Dihydrogen does not act as a reducing agent.
4. Hydrogen has three isotopes of which protium is the most common.
Subtopic:  Preparation & Properties |
 66%
From NCERT
NEET - 2016
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The ease of adsorption of the hydrated alkali metal ions on 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 |
 66%
From NCERT
AIPMT - 2012
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The method used to remove the temporary hardness of water is-

1. Synthetic resins method

2. Calgon's method

3. Clark's method

4. Ion-exchange method

Subtopic:  Hard & Soft Water |
 79%
From NCERT
NEET - 2019
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Links
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Match the following and identify the correct option

(a) CO(g)+H2(g) (i) Mg(HCO3)2+Ca(HCO3)2
(b) Temporary hardness of water (ii) An electron deficient hydride
(c) B2H6 (iii) Synthesis gas
(d) H2O2 (iv) Non-planar structure
 
(a) (b) (c) (d)
1. (iii) (ii) (i) (iv)
2. (iii) (iv) (ii) (i)
3. (i) (iii) (ii) (iv)
4. (iii) (i) (ii) (iv)
Subtopic:  Hard & Soft Water | H2O2 (Hydrogen Peroxide) |
 85%
From NCERT
NEET - 2020
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Some statements about water are given below:
 

(a) Heavy water is used as a moderator in nuclear reactors.
(b) Heavy water is more associated than ordinary water.
(c) Heavy water is a more effective solvent than ordinary water.
 

Which of the above statements are correct?

1. (a), (b), and (c)

2. (b) and (c)

3. (a) and (c)

4. (a) and (b)

Subtopic:  Hydrogen- Types & Isotopes |
 61%
From NCERT
AIPMT - 2010
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The pair that on reaction will not evolve H2 gas is  

1.  Copper and HCl (aqueous)
2.  Iron and steam
3.  Iron and H2SO4 (aqueous)
4.  Sodium and ethyl alcohol

Subtopic:  Preparation & Properties |
 54%
From NCERT
AIPMT - 1998
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 H2Oon oxidation gives:

1. O-2

2. OH-

3. O2-

4. O2

Subtopic:  H2O2 (Hydrogen Peroxide) |
 58%
From NCERT
AIPMT - 1999
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Pure water can be obtained from sea water by:

1.  Centrifugation
2.  Plasmolysis
3.  Reverse osmosis
4.  Sedimentation

Subtopic:  Water |
 77%
From NCERT
AIPMT - 2001
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