The correct order of hydrogen bonding among NH3, H2O and HF, is 

1. HF > H2O > NH3

2. H2O > HF > NH3

3. HF > NH3 > H2O

4. NH3 > HF > H2O

Subtopic:  Type of Hydride | Water |
From NCERT
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The term ’auto-protolysis’ of water means :

1. Physical reaction in which two water molecules react to produce a hydroxide ion (OH) and a hydronium ion (H3O+).
2. Chemical reaction in which five water molecules react to produce a hydroxide ion (OH) and a hydronium ion (H3O+).
3. Chemical reaction in which two water molecules react to produce a hydroxide ion (OH) and a hydronium ion (H3O+).
4. Chemical reaction in which two water molecules react to produce three hydroxide ions (OH)

Subtopic:  Water |
 74%
From NCERT
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The correct statement about the reaction of water with fluorine is:

1. O is reduced from 0 to -1 oxidation state, whereas F is oxidized from –2 to 0
2. F is reduced from 0  to -1 oxidation state, whereas O is oxidized from –2 to 0
3. F is reduced from 0 to –2 oxidation state, whereas O is oxidized from – 2 to -1
4. O is reduced from 0 to –2 oxidation state, whereas F is oxidized from –3 to 0

Subtopic:  Water |
 80%
From NCERT
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The structure of the common form of ice is :

1. Each hydrogen atom is surrounded tetrahedrally by four other oxygen atoms at a distance of 540 pm.
2. Each hydrogen atom is surrounded tetrahedrally by four other oxygen atoms at a distance of 276 pm.
3. Each oxygen atom is surrounded tetrahedrally by four other oxygen atoms at a distance of 276 pm.
4. Each oxygen atom is surrounded tetrahedrally by four other oxygen atoms at a distance of 540 pm.

Subtopic:  Water |
 58%
From NCERT
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Water acts as a base in -

1. Reaction with H2S

2. Reaction with NH3

3. Reaction with NaOH

4. All of the above

Subtopic:  Water |
 61%
From NCERT
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‘Demineralised’ water can be obtained by :

1. Passing water successively through an anion exchange (in the K+ form) and cation exchange (in the Mn- form) resin
2. Passing water successively through a cation exchange (in the H+ form) and an anion exchange (in the OH- form) resin
3. Passing water successively through an anion exchange (in the O+ form) and cation exchange (in the OH- form) resin
4. Passing water successively through a cation exchange (in the OH- form) and an anion exchange (in the H+ form) resin

Subtopic:  Water |
 74%
From NCERT
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Demineralized or distilled water is not useful for drinking purposes because -

1. Demineralised water contains all insoluble minerals. 

2. Demineralised water is free of all soluble minerals. 

3. Demineralised water contains soluble minerals. 

4. Demineralised water contains soluble anion only.

Subtopic:  Water |
 73%
From NCERT
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Water is important in the biosphere and biological systems because :

1. It constitutes around 65% of the human body and 95% of plants
2. It acts as a carrier of various nutrients required by plants and animals for various metabolic reactions.
3. The high heat of vaporization and heat of capacity of water helps in moderating the climate and body temperature of all living beings
4. All of the above.

Subtopic:  Water |
 91%
From NCERT
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The properties of water which make it useful as a solvent is/are -

1. A high value of dielectric constant  

2. A high value of dipole moment

3. A high value of lattice energy

4. Both '1' and '2'

Subtopic:  Water |
 78%
From NCERT
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D2O cannot be used for drinking purposes, because - 

1.  it increases the rate of catabolic reactions 

2. it slows the rate of anabolic and catabolic reactions

3. it slows the rate of anabolic reactions.

4. it increases the rate of a reaction.

Subtopic:  Water |
 72%
From NCERT
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