Density of water is maximum at:

1. 0°C

2. 100 °C

3. 4°C

4. 0 K

Subtopic:  Water |
 72%
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An ionic compound is dissolved simultaneously in heavy water and ordinary water, its solubility is –

1. Larger in heavy water

2. Smaller in heavy water

3. Solubility is same in both waters

4. Smaller in simple water

Subtopic:  Water |
 68%
From NCERT
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H2O has higher boiling point than H2S because.

(1) H2O is a smaller molecule and hence more closely packed

(2) The bond angle in H2O is more than in H2S and hence the former molecules are more tightly packed

(3) Of intermolecular hydrogen bonding in liquid H2O

(4) The latent heat of vaporisation is higher for H2O than for H2S

Subtopic:  Water |
 83%
From NCERT
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The maximum possible number of hydrogen bonds a water molecule can form is –

(1) 2                                         

(2) 4

(3) 3                                         

(4) 1

Subtopic:  Water |
 70%
From NCERT
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Assertion:  D2O is called heavy water.

Reason : Its degree of dissociation is high.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Water |
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Of the two solvents H2O and D2O, NaCl dissolves:

(1) equally in both

(2) only in H2O

(3) more in D2O

(4) more in H2O

Subtopic:  Water |
 68%
From NCERT
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Heavy water is ......% heavier than ordinary water

1. 11

2. 20

3. 25

4. 15

Subtopic:  Water |
 59%
From NCERT
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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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 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 |
 73%
From NCERT
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