$A$ glass tumbler containing hot water is kept in the freezer compartment of a refrigerator (temperature $< 0\,^{\circ}\text{C}$). If you could measure the temperature of the content of the tumbler,which of the following graphs would correctly represent the change in its temperature as a function of time?

You are provided with a mixture of naphthalene and ammonium chloride by your teacher. Suggest an activity to separate them with a well-labelled diagram.

Classify the following processes into osmosis or diffusion:
$(a)$ Swelling up of a raisin on keeping in water.
$(b)$ Spreading of virus on sneezing.
$(c)$ Earthworm dying on coming in contact with common salt.
$(d)$ Shrinking of grapes kept in thick sugar syrup.
$(e)$ Preserving pickles in salt.
$(f)$ Spreading of smell of cake being baked throughout the house.
$(g)$ Aquatic animals using oxygen dissolved in water during respiration.

$(a)$ Enumerate the changes that take place in a liquid during evaporation.
$(b)$ How is the rate of evaporation affected by changes in the following? Justify your answer.
$(i)$ Temperature
$(ii)$ Wind speed
$(iii)$ Humidity

Carbon dioxide was taken in an enclosed cylinder and compressed by applying pressure.
$(a)$ Which state of matter will we obtain after completion of the process?
$(b)$ Name and define this process.
$(c)$ What is the common name of the product obtained in the above process?

$(a)$ $CO_2$ is a gas. Write its two gaseous properties to justify it.
$(b)$ How can we liquefy a gas?
$(c)$ Solid $CO_2$ is also known as dry ice. Why?
$(d)$ Write the full form of:
$(i)$ $CNG$
$(ii)$ $LPG$