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प्रश्न
Give reason for the following:
In the preparation of hydrogen by electrolysis of water – the distilled water used is acidified.
उत्तर
Pure or distilled water is bad conductor of electricity and does not form ions. To increase the number of H+ ions distilled water is acidified and made good conductor of electricity.
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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 |
FILL IN THE BLANK
In electrolysis of water, dilute sulphuric acid is added to increase ..................of water.
Hydrogen gas is collected by the downward displacement of water. Give reason ?
Choose the correct option:
Elements which show unique nature in the preparation of hydrogen are:
Complete and balance the following reaction.
Na + H2O →_____________ +___________
Complete and balance the following reaction.
Zn + H2O →_____________ +___________
Select the correct options for the following statement:
A foul smelling gas formed when hydrogen reacts with a molten non-metal, is ___.
Complete and balance the equation:
[General method]
Reactions of metals - alkali [conc. soln.]
Lead - Pb + 2NaOH → ______ + _______ [g]
Give a balanced equation for obtaining hydrogen from?
Steam using a trivalent metal
