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प्रश्न
Give reason for the following:
Dilute sulphuric acid cannot be replaced by concentrated acid in the preparation of hydrogen.
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उत्तर
Dilute sulphuric acid cannot be replaced by concentrated acid in the preparation of hydrogen because it is a strong oxidising agent and it will produce sulphur dioxide.
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संबंधित प्रश्न
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 |
Hydrogen gas is collected by the downward displacement of water. Give reason ?
Which metal is preferred for the preparation of hydrogen?
from water?
Give reason for the following:
The end of the thistle funnel should be dipped under acid.
Hydrogen can be prepared with the help of cold water. Give a reaction of hydrogen with:
A divalent metal
Complete and balance the following reaction.
Fe + H2O →_____________ +___________
Complete and balance the equation:
[General method]
Reactions of active metals - cold water
Potassium- K + H2O → ______+ ______ [g]
Complete and balance the equation:
[General method]
Reactions of metals - alkali [conc. soln.]
Aluminium - 2Al + 2NaOH + 2H2O → ______ + _______ [g]
2Al + 2KOH + 2H2O → _____ + _____ [g]
Give a balanced equation for obtaining hydrogen from?
Steam using a metal – and the reaction is reversible.
State why hydrogen is not prepared in the laboratory by the action of sodium with cold water.
