How gaseous pressure arises?

Define Sublimation.

A few drops of ‘Dettol’ when added to water the mixture turns turbid. Why?

Name the method you would adopt to separate a mixture of ammonium chloride and common salt.

You have just won a medal made of 22-carat gold. Have you just procured a pure substance or impure substance?

'Shake well before use'. This is the instruction on a bottle of medicine. What kind of a mixture is contained in the bottle? Give reason.

What produces more severe burns, boiling water or steam? Why?

The most appropriate labelling of X and Y in a filtration set up are

	X	Y
(a)	precipitate	solvent
(b)	solvent	solute
(c)	residue	filtrate
(d)	filtrate	residue

Is air a pure substance or Mixture? Justify.

You must have seen brass statues in museums and places of worship. Brass is an alloy made up of approx.30% zinc and 70% copper. Is Brass a pure substance or a mixture or compound?