Explain what is meant by efflorescence.

Give the systematic names for the following
Milk of magnesia

Mention the uses of plaster of paris

Beryllium halides are Covalent whereas magnesium halides are ionic why ?

How is plaster of paris prepared ?

Li₂CO₃ decomposes readily. Why?

Explain with equations beryllium hydroxide is amphoteric.

Alkali metal hydrides are strong reducing agents. Prove this statement.

How is barium peroxide prepared?

Write a note about physical appearance of gypsum.

Suppose there is a tiny sticky area on the wall of a container of gas. Molecules hitting this area stick there permanently. Is the pressure greater or less than on the ordinary area of walls?

Distinguish between diffusion and effusion.

Aerosol cans carry clear warning of heating of the can. Why?

Why do astronauts have to wear protective suits when they are on the surface of moon?

Defind pressure. Give its units.

Give an expression for the rates of diffusion of two different gases and their molecular weighs.

Give an expression for the diffusion of two gases diffusing at different pressures P_A and P_B and their molecular weighs.

Calculate the pressure exerted by 2 moles of sulphur hexafluoride in a steel vessel of volume 6 dm³ at 70°C assuming it is an ideal gas.

Define pressure. Give its units.

CO₂ gas cannot be liquefied at room temperature. Give reason.