Density of water is maximum at:

1. 0°C

2. 100 °C

3. 4°C

4. 0 K

Subtopic:  Water |
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Atomic hydrogen is obtained by:

1. electrolysis of heavy water

2. reaction of water with heavy metals

3. thermal decomposition of water

4. passing silent electric discharge through hydrogen at low pressure

Subtopic:  Hydrogen- Types & Isotopes |
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Permutit is:

1. hydrated sodium aluminium silicate

2. sodium hexa meta-phosphate

3. sodium silicate

4. sodium meta-aluminate

Subtopic:  Hard & Soft Water |
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Hydrogen is not obtained when zinc reacts with:

1. cold water

2. dil. H2SO4

3. dil HCl

4. hot 20% NaOH

Subtopic:  Hydrogen- Types & Isotopes | Preparation & Properties |
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The volume strength of 1.5N H2O2 Solution is :

1. 4.8

2. 8.4

3. 3.0

4. 8.0

Subtopic:  H2O2 (Hydrogen Peroxide) |
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Very pure hydrogen (99.9%) can be made by which of the following processes ?

1. Mixing natural hydrocarbons of high molecular weight

2. Electrolysis of water

3. Reaction of salt like hydrides with water

4. Reaction of methane with steam

Subtopic:  Preparation & Properties |
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Para hydrogen at room temperature is:

1. Less stable than ortho hydrogen.

2. More stable than ortho hydrogen.

3. As stable as ortho hydrogen.

4. None of the above.

Subtopic:  Hydrogen- Types & Isotopes |
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Hydrogen combines directly with:

1. Ca

2. Cu

3. Zn

4. Fe

Subtopic:  Type of Hydride |
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Acidified solution of chromic acid on treatement with H2O2 yields :

1. CrO3 + H2O + O2

2. Cr2O2 + H2O + O2

3. CrO5 + H2O + K2SO4

4. H2Cr2O7 + H2O + O2

Subtopic:  H2O2 (Hydrogen Peroxide) |
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What is formed when calcium carbide reacts with heavy water?

1. C2D2

2. CaD2

3. Ca2D2O

4. CD2

Subtopic:  Hydrogen- Types & Isotopes |
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