Metal which does not react with cold water but evolves H2 with steam is:

1. Na

2. K

3. Pt

4. Fe

Subtopic:  Hydrogen- Types & Isotopes | Water |
 57%
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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 |
 68%
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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 |
 65%
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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 |
 64%
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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 |
 57%
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Hydrogen combines directly with:

1. Ca

2. Cu

3. Zn

4. Fe

Subtopic:  Type of Hydride |
 59%
From NCERT
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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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The ortho and para hydrogen possess:

1. same physical properties but different chemical properties

2. different physical properties but same chemical properties

3. same chemical and physical properties

4. different physical and chemical properties

Subtopic:  Hydrogen- Types & Isotopes |
 54%
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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%
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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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