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Standard VI

Chemistry

Composition of Air

Usha took a l...

Question

Usha took a lump of dry soil in a glass and added water to it till it was completely immersed. She observed bubbles coming out. The bubbles contain

water vapour

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only oxygen gas

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air

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none of these

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Solution

The correct option is C air
(c) air

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Question 8

Usha took a lump of dry soil in a glass and added water to it till it was completely immersed. She observed bubbles coming out. The bubbles contain

a) Water vapour

b) Only oxygen gas

c) Air

d) None of these

Bubbles coming out of a lump of soil when water is poured on it represent ___.

Paheli kept some water in a beaker for heating. She observed that tiny bubbles appeared before the water started to boil. She boiled the water for about 5 minutes and filled it in a bottle up to the brim and kept the bottle airtight till it cooled down to room temperature.

(a) Why did the tiny bubbles appeared?

(b) Do you think tiny bubbles will appear on heating the water taken out from the bottle? Justify your answer

oojho took an empty plastic bottle, turned it upside down and dipped its open mouth into a bucket filled with water. He then tilted the bottle slightly and made the following observations.

(i) Bubbles of air came out from the bottle.

(ii) Some water entered the bottle.

(iii) Nitrogen gas came out in the form of bubbles and oxygen gets dissolved in water.

(iv) No bubbles formed, only water entered the bottle

Which observations is/are correct?

An experiment was performed to know about the source of air for the aquatic organisms. The experiment was as follows:

Take some water in a glass vessel. Heat it slowly on a tripod stand. Before the water begins to boil, look carefully at the inner surface of the vessel. Observe the bubbles that are coming up. Where are these bubbles coming from?

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Composition of Air

Standard VI Chemistry

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Usha took a lump of dry soil in a glass and added water to it till it was completely immersed. She observed bubbles coming out. The bubbles contain

The correct option is C air(c) air

The correct option is C air
(c) air