Question

Three wide-mouthed calibrated bottles A, B and C are taken as shown in the figure above. In
each of the three arrangements, a big candle is fixed in a trough and a solution of sodium
hydroxide is poured into the solution into the trough. The graduated bottles are inverted over
the candles. In each of A, B and C the level of the solution touches the zero mark. The bottles
are taken out. In A, the candle is lit up and immediately the bottle is replaced. In B, the candle
is lit up similarly but covered with the bottle filled with oxygen only. In C, the candle is lit up
but it is covered with the bottle filled with nitrogen only.
a) Why was sodium hydroxide poured in the trough?
b) Explain the difference in observation in A, B and C.

Answer 1

Answer:

each of the three arrangements, a big candle is fixed in a trough and a solution of sodium

hydroxide is poured into the solution into the trough. The graduated bottles are inverted over

the candles. In each of A, B and C the level of the solution touches the zero mark. The bottles

are taken out. In A, the candle is lit up and immediately the bottle is replaced. In B, the candle

is lit up similarly but covered with the bottle filled with oxygen only. In C, the candle is lit up

but it is covered with the bottle filled with nitrogen only.

a) Why was sodium hydroxide poured in the trough?

b) Explain the difference in observation in A, B and C.

Explanation:

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