Polyphosphates are used as water softening agents because they –

(1) form soluble complexes with anionic species

(2) precipitate anionic species

(3) form soluble complexes with cationic species

(4) precipitate cationic species

Subtopic:  Hard & Soft Water |
 56%
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Permanent hardness of water can be removed, by adding –

(1) Soda lime

(2) Sodium bicarbonate

(3) Washing soda

(4) Sodium chloride

Subtopic:  Hard & Soft Water |
 75%
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The correct increasing order of the acidity of CO2, H2O and H2O2 is -

(1) CO2<H2O2<H2O                         

(2) H2O<H2O2<CO2

(3) H2O<H2O2>CO2                         

(4) H2O2>CO2>H2O

Subtopic:  Preparation & Properties |
 59%
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At absolute zero.

(1) Only para hydrogen exists

(2) Only ortho hydrogen exists

(3) Both para and ortho hydrogen exist

(4) None of these

Subtopic:  Hydrogen- Types & Isotopes |
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Metal which does not react with cold water but evolves H2 with steam is –

(1) Na                           

(2) K

(3) Pt                             

(4) Fe

Subtopic:  Preparation & Properties |
 55%
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The oxidation states of the most electronegative element in the products of the reaction between BaO2 with dil. H2SO4 are–

1. 0, and –1                                   

2. –1, and –2

3. –2, and 0                                     

4. –2, and + 1

Subtopic:  H2O2 (Hydrogen Peroxide) |
 63%
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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%
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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%
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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%
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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%
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