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Give reason for the following:
Though hydrogen is lighter than air it cannot be collected by downward displacement of air.
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Name the following:
Two metals which give hydrogen with cold water.
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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 |
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Multiple Choice Question
The metal which reacts with cold water to produce hydrogen is
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Multiple Choice Question
Water gas is a mixture of
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MULTIPLE CHOICE QUESTIONS
Hydrogen burns in oxygen to form
- hydrogen sulphide
- nitrates
- water
- ammonia
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FILL IN THE BLANK
........................... means ‘maker of water’ in Greek.
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FILL IN THE BLANK
In electrolysis of water, dilute sulphuric acid is added to increase ..................of water.
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TRUE \ FALSE
Hydrogen does not combine with nitrogen under ordinary conditions.
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TRUE \ FALSE
reacts with hot water to form copper oxide and hydrogen.
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MATCH THE COLUMNS
| column A | column B |
| 1. `""2H_2 + O_2 → 2H_2O` | A. This reaction is not possible |
| 2. `""H_2+CI_2 →2HCI` | B.This reaction is exothermic to the extent of explosion |
| 3.`""ZaO+ H^2→Zn +H_2O` | C.This reaction is known as Haber process |
| 4.`""Cu + H_2SO^4 → CuSO_4 + H_2 ` | D.This reaction illustrates the reducing property of bydrogen |
| 5.`""N_2 +3H_2 → 2NH_3 +heat ` | E. This reaction takes place in diffused sunlight |
| F. This reaction is a method of preparation of hydrogen |
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Hydrogen gas is collected by the downward displacement of water. Give reason ?
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How do different metals displace hydrogen from water? Explain with the help of equations.
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Give two uses for the following:
coke
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State how hydrogen occurs in the free state. Name three compounds containing hydrogen in the combined state.
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‘Hydrogen is obtained by electrolysis of acidified water’.
Answer the following pertaining to the preparation of hydrogen by electrolysis,
The meaning of the term ‘electrolysis’ and ‘electrolyte’.
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‘Hydrogen is obtained by electrolysis of acidified water’.
Answer the following pertaining to the preparation of hydrogen by electrolysis,
Name the electrode –
- through which the current enters the electrolyte.
- at which hydrogen is liberated.
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Starting from hydrogen gas how would you obtain a neutral liquid.
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Starting from hydrogen gas how would you obtain a basic gas.
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Starting from hydrogen gas how would you obtain a metal by reduction of its heated oxide.
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