Pooja fixed a candle at the bottom of the container holding water. After lighting the candle, she inverted a glass jar over it. What do you think she observed?

The flame continued to burn, and water rose in the jar.

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The flame was put off, and black smoke got deposited on the sides of the jar.

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The flame continued to burn, and molten wax felt into the water.

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The flame was put off and water rose in the jar.

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Solution

The correct option is D The flame was put off and water rose in the jar.
The flame of the candle will burn till there is oxygen available in the jar. After sometime, when all the oxygen is consumed, candle flame will go off. The water from the container will rise in the jar to occupy the space of the consumed oxygen gas.

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Similar questions

Q. If you fix a burning candle on a petri dish, it will continue to burn, but when you put an inverted beaker over it, the flame goes off. Why does this happen?

Q. Radhika performed an experiment and wrote a record of what she had done. Can you rewrite these sentences in the correct order to describe her work? Draw a picture of her experiment. Can you explain what she observed?
(a) I used my wrist watch to check how long each candle burned.
(b) In the lid of the first jar, I punched several small holes.
(c) With my older brother's help, I fixed one candle in each jar and lit them.
(d) I collected the following items: two identical jam jars with lids, two identical small candles, matches, a nail and a hammer.
(e) I left the second jar open.
(f) I wanted to compare the time for which the candles could burn in the two jars.
(g) The second candle continued to burn for a long time.
(h) The candle in the first jar went out first and the jar was filled with smoke.
(i) I closed the first jar with its own lid.

In the given figure, a burning candle is kept in the trough containing water. It is put off after some time when covered by an inverted gas jar.

What can be concluded from the above activity?

Q. Assertion :When

H C l

in a jar is poured into a jar containing burning candle, the candle is put out. Reason:

H C l

is a fire extinguisher.

Give reasons :

(a) Hydrogen is collected by the downward displacement of water and not of air, even though it is lighter than air.

(b) A candle brought near the mouth of a jar containing hydrogen gas starts burning but is extinguished when pushed inside the jar.

(d) Apparatus for laboratory preparation of hydrogen should be air tight and away from a naked flame.

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