Temporary hardness is caused due to the presence of:

1. CaSO4

2. CaCl2

3. CaCO3

4. Ca(HCO3)2

Subtopic:  Hard & Soft Water |
 78%
From NCERT
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H2O2 is prepared in the laboratory by the reaction of :

1. MnO2 with dilute cold H2SO4

2. BaO2 and  CO2 bubbling through cold water

3. PbO2 with an acidified solution of KMnO4

4. Na2O2 with boiling water

Subtopic:  H2O2 (Hydrogen Peroxide) |
 73%
From NCERT
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A 1000 g aqueous solution of CaCO3 contains 10 g of calcium carbonate. The hardness of the solution is:

1. 10 ppm

2. 100 pm

3. 1000 ppm

4. 10000 ppm

Subtopic:  Hard & Soft Water |
 55%
From NCERT
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Hydrogen adsorbed on palladium is known as:

1. Atomic H

2. Nascent H

3. Occluded H

4. Heavy H

Subtopic:  Hydrogen- Types & Isotopes |
 50%
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A compound that acts as both reducing and oxidising agent is-

1. H2SO4

2. H2O2

3. KOH

4. KMnO4

Subtopic:  H2O2 (Hydrogen Peroxide) |
 93%
From NCERT
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A given solution of H2O2 is 30 volume. Its concentration in terms of molarity is:

1. 9.1 M

2. 2.68 M

3. 2.5 M

4. 26.8 M

Subtopic:  H2O2 (Hydrogen Peroxide) |
 65%
From NCERT
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The decomposition of H2O2 is accelerated by:

1. traces of acids

2. finely divided metals

3. acetanilide

4. alcohol

Subtopic:  H2O2 (Hydrogen Peroxide) |
 67%
From NCERT
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 Hardness of water cannot be removed by -

1. Clark's method

2. Adding washing soda

3. Calgon process

4. Filtration

Subtopic:  Hard & Soft Water |
 85%
From NCERT
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A mixture of hydrazine and 60 to 90 percent of H2O2 solution is:

1. antiseptic

2. rocket fuel

3. germicide

4. insecticide

Subtopic:  H2O2 (Hydrogen Peroxide) |
 51%
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On bubbling CO2 through a solution of barium peroxide in water:

1. O2 is formed

2. H2CO3 is formed

3. H2O2 is formed

4. H2 is formed

Subtopic:  H2O2 (Hydrogen Peroxide) |
 75%
From NCERT
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