Which among the following statements is incorrect?

Air is required for burning

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Air exerts pressure on the surroundings

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It is easy to crush a closed plastic bottle

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Air contains gases like nitrogen, oxygen and carbon dioxide

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Solution

The correct option is C
It is easy to crush a closed plastic bottle

It is difficult to crush a closed plastic bottle because the air trapped inside the bottle applies huge pressure from the inside, hence, making it difficult to crush.

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Similar questions

Q. State whether the following statements are true or false.
(a) Air consists of a single substance.
(b) When water is poured into a glass, air is pushed out of the glass.
(c) Trees need oxygen for photosynthesis.
(d) When we exhale, we give out the carbon dioxide produced in the body.
(e) The amount of water vapour in the air is always the same.
(f) Nitrogen is required by plants to make proteins.
(g) Aircrafts fly in the ionosphere as there is less friction in this zone.
(h) One per cent of air contains carbon dioxide, argon, helium, argon and krypton-all of which are inert gases.
(i) LPG and CNG burn using oxygen gas and release carbon dioxide gas.
(j) Nitrogen in the air also helps in burning.

Q. Acetylene

[C_{2} H_{2}]

burns in air forming carbon dioxide and water vapour. Calculate the volume of air required to completely burn

50 c m^{3}

of acetylene (Assume air contains 20 % oxygen):

Manisha took some vinegar in a test tube and added some baking powder to it . Then she lit a matchstick and brought it near the mouth of the test tube . The flame of the matchstick got extinguished.

Which of the following is correct conclusion regarding the given experiment .

(A) Carbon dioxide gas does not support burning .

(B) Air contains carbon dioxide .

(D) Oxygen gas can extinguish fire .

Q. Atmospheric air contains the following in varying amounts
(a) Nitrogen
(b) Carbon dioxide
(c) Argon
(d) Oxygen

Natural air contains oxygen, nitrogen and carbon dioxide in the ratio 12 : 5 : 3. Find the percentage of nitrogen in the air.

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Which among the following statements is incorrect?

The correct option is C It is easy to crush a closed plastic bottle It is difficult to crush a closed plastic bottle because the air trapped inside the bottle applies huge pressure from the inside, hence, making it difficult to crush.

The correct option is C
It is easy to crush a closed plastic bottle

It is difficult to crush a closed plastic bottle because the air trapped inside the bottle applies huge pressure from the inside, hence, making it difficult to crush.