Chemistry
Grade-8
Easy
Question
In the laboratory preparation of Hydrogen, it is collected by downward displacement of water. It is also collected after all the air in the apparatus is allowed to escape because:
- Hydrogen forms an explosive mixture with air.
- Hydrogen is lighter than air.
- Hydrogen gas is slightly soluble in water
- All of these.
Hint:
Hydrogen is the most abundant and highly flammable element in the universe and is insoluble in water. This recovery method is used for insoluble gases.
The correct answer is: All of these.
The correct option is d)All of these.
Hydrogen readily oxidizes in the presence of air. In other words, hydrogen is easily mixed with air and cannot be recovered by this method. So from above we can see that although hydrogen is lighter than air, it is collected by the downward movement of water, not air. Hydrogen gas forms flammable or explosive mixtures with atmospheric oxygen.
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