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Combustion

Gas X has the...

Question

Gas X has the properties as given below:
1) Colourless and odourless
2) neither burns nor supports burning
3) extinguishes a burning fire
4) minor component of air.
Based on the above characteristics, identify X.

A

Nitrogen

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B

Oxygen

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C

Carbon dioxide

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Solution

The correct option is C Carbon dioxide

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Q. A student takes about 2 mL ethanoic acid in a dry test tube and adds a pinch of sodium hydrogen carbonate to it. He reports the following observations:

I. Immediately a colourless and odourless gas evolves with a brisk effervescence.
II. The gas turns lime water milky when passed through it.
III. The gas burns with an explosion when a burning splinter is brought near it.
IV. The gas extinguishes the burning splinter that is brought near it.
The correct observation is:

Q. Ethanoic acid was added to sodium hydrogen-carbonate solution and the gas evolved was tested with a burning splinter. The following four observations were reported:
(a) The gas burns with the pop sound and the flame gets extinguished.
(b) The gas does not burn but the splinter burns with a pop sound.
(c) The flame extinguishes and the gas does not burn.
(d) The gas burns with a blue flame and the splinter burns brightly.

The correct observation is reported in :
(1) (a)
(2) (b)
(3) (c)
(4) (d)

Q. name the component of air that neither supports burning nor extinguishes burning

Q. The gas X is colourless and odourless having a slightly sour taste which is a minor component of air. It is moderately soluble in water. This gas neither burns nor supports burning. It rather extinguishes a burning fire. If there was no gas X in air, there would be no plants and animals on the earth.
a) Name the gas X
b) What is the percentage of gas X in air?
c) Why is gas X very important for the existence of all life?

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