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प्रश्न
Fill in the blank
Hydrogen is ..................... than air.
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उत्तर
Hydrogen is lighter than air.
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संबंधित प्रश्न
Fill in the blank
Hydrogen reacts with metal oxides to form ............and....................
Match the statements in Column A with those in Column B.
| Column A | Column B |
|
1. A metal which reacts with cold water to from hydrogen. |
1. Reduction |
| 2. A gas which is inflammable and non-supporter of combustion | 2. Hydrogenation |
|
3. A process in which vanspati ghee is prepared from vegitable oils |
3. oxidation |
|
4. The removal ofhydrogen or addition of oxygen |
4. sodium |
| 5. The addition of hydrogen or removal of oxygen | 5. Hydrogen |
Multiple Choice Question
The metal which reacts with cold water to produce hydrogen is
For laboratory preparation of hydrogen, give the following:
method of collection
Complete and balance the following reaction.
Na + H2O →_____________ +___________
Complete and balance the following reaction.
Al + H2SO4 →_____________ +___________
Complete and balance the following reaction.
Fe + HCl →_____________ +___________
Correct the following statement:
Hydrogen is separated from CO by passing the mixture through caustic potash solution.
Complete and balance the equation:
[General method]
Reactions of metals - alkali [conc. soln.]
Zinc - Zn + 2NaOH → ______ + _______ [g]
Zn + 2KOH → ____ + _____ [g]
State why hydrogen is not prepared in the laboratory by the action of sodium with cold water.
