When a gas jar containing colourless air is kept upside down over a gas jar full of brown-coloured bromine vapour, then after some time, the brown colour of bromine vapour spreads into the upper gas jar making both the gas jars appear brown in colour. Which of the following conclusion obtained from these observations is incorrect?

(a) bromine vapour is made of tiny paricles which are moving

(b) air is made up of tiny particles which are moving

(c) the paricles of bromine are moving but those of air not moving

(d) even though bromine vapour is heavier than air, it can move up against gravity

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Solution

Correct option (c)
The particles of bromine are moving but those of air are not moving is incorrect because the particles of matter are constantly in motion. It appears as if the air molecules are not moving because air is colorless

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Q. When a gas jar containing colourless air is kept upside down over a gas jar full of brown-coloured bromine vapour, then after some time, the brown colour of bromine vapour spreads into the upper gas jar making both the gas jars appear brown in colour. Which of the following conclusion obtained from these observations is incorrect?
(a) bromine vapour is made of tiny particles which are moving
(b) air is made up of tiny particles which are moving
(c) the particles of bromine are moving but those of air are not moving
(d) even though bromine vapour is heavier that air, it can move up against gravity

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Correct option (c) The particles of bromine are moving but those of air are not moving is incorrect because the particles of matter are constantly in motion. It appears as if the air molecules are not moving because air is colorless

Correct option (c)
The particles of bromine are moving but those of air are not moving is incorrect because the particles of matter are constantly in motion. It appears as if the air molecules are not moving because air is colorless