State whether the following statement is true or false :Red-brown bromine vapour diffuse into air in a gas jar but the colourless air molecules do not diffuse into bromine vapour.

Academic Chemistry NCERT Class 9

False.

Air also diffuses into the bromine vapour but because air is colourless, we are not able to see its movement.

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Updated on: 10-Oct-2022

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When a gas jar containing air is inverted over a gas jar containing bromine vapour, the red-brown bromine vapour diffuses into air. Explain how bromine vapour diffuse into air.
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
Which of the two diffuses slower: bromine vapour into air or copper sulphate into water?
When a gas jar full of air is placed upside down on a gas jar full of bromine vapours, the red-brown vapours of bromine from the lower jar go upward into the jar containing air. In this experiment :(a) air is heavier than bromine(b) both air and bromine have the same density(c) bromine is heavier than air(d) bromine cannot be heavier than air because it is going upwards against gravity
Bromine and air take about 15 minutes to diffuse completely but bromine diffuses into a vacuum very rapidly. Why is this so?
A student placed a gas jar containing air in the upside-down position over a gas jar full of red-brown bromine vapours. He observed that the red-brown colour spread upwards into the jar containing air. Based on this observation, the student concluded that it is only the bromine vapour which moves up and diffuses into the air in the upper jar, the air from the upper jar does not move down by diffusion into the lower jar containing bromine vapours. Do you agree with this conclusion of the student? Give a reason for your answer.
Bromine particles are almost twice as heavy as chlorine particles. Which gas will diffuse faster; bromine (vapour) or chlorine? Explain your answer.
Do solids diffuse into liquid ?
Choose the correct statement from the following:(a) the volume of gas ” expands on heating(b) two gases cannot diffuse into each other(c) gas is converted into solid, it is called condensation(d) gases cannot diffuse in solids
Which of the following statements are “true”?(a) Water vapour is present in air only during the monsoon.(b) Water evaporates into air from oceans, rivers and lakes but not from the soil.(c) The process of water changing into its vapour is called evaporation.(d) The evaporation of water takes place only in sunlight.(e) Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler.
State whether the following statement is true or false :Milk is a pure substance.
State whether the following statement is true or false: Sound produced by a vibrating body travels to our ears by the actual movement of air.
Consider the following statements and choose the correct one:(a) We know that air or atmosphere always contains some water vapour or moisture in it.(b) Humidity is a measure of water vapour or moisture in air.(c) When the amount of water vapour in the air is high, we say humidity is high and the air feels moist or damp.(d) All the above.
State whether the following statement is true or false:An electric motor converts mechanical energy into electrical energy.
State whether the following statement is true or false : Earth moves round the sun with uniform velocity.

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