Hardness of water is due to presence of salts of –

(1) Na+ and K+                                  

(2) Ca2+ and Mg2+

(3) Ca2+ and K+                                 

(4) Ca2+ and Na+

Subtopic:  Hard & Soft Water |
 96%
From NCERT
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Ice melts at a temperature lower than its usual melting point when the pressure is increased. This is because-

1. Ice has less density than water

2. Pressure generates heat

3. The chemical bonds break under pressure

4. Ice is not a true solid

Subtopic:  Preparation & Properties |
 61%
From NCERT
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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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The method used for the preparation of H2O2 is -

1. Cold H2SO4 + BaO2.8H2O                             

2. HCl + BaO2

3. Conc. H2SO4 + Na2O                         

4. H2 + O2

Subtopic:  H2O2 (Hydrogen Peroxide) |
 73%
From NCERT
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The oxide that gives hydrogen peroxide H2O2 on the treatment with a dilute acid H2SO4 is –

(A) MnO2                                  

(B) PbO2

(C) Na2O2                                 

(D) TiO2 

Subtopic:  H2O2 (Hydrogen Peroxide) |
 51%
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The oxidising property of H2O2 is best explained by assuming that two oxygen atoms in its molecule are.

(1) Bonded differently

(2) Bonded similarly

(3) Bonded covalently

(4) Bonded by hydrogen bonds

Subtopic:  H2O2 (Hydrogen Peroxide) |
 67%
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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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On partial hydrolysis of one mole of peroxodisulphuric acid produces

1. two moles of sulphuric acid

2. two moles of peroxomonosulphuric acid

3. one mole of sulphuric acid and one mole of peroxomonosulphuric acid

4. one mole of sulphuric acid, one mole of peroxomonosulphuric acid and one mole of hydrogen peroxide.

Subtopic:  H2O2 (Hydrogen Peroxide) |
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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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H2O2 acts as antiseptic due to its –

(1) Reducing property                           

(2) Oxidising property

(3) Bleaching property                           

(4) Acidic property

Subtopic:  H2O2 (Hydrogen Peroxide) |
 55%
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