Test: Separation Of Solid Mixtures - Class 9 MCQ

The condenser is not required in sublimation. Because there is no need for condensing. Sublimation means changing solid into Gas. So there is no need for Condenser.

Ammonium chloride changes into vapours and get deposited on the cooler parts of the funnel.

A molecule of carbon dioxide has a slight negative charge near the oxygen and a slight positive charge near the carbon. CO2 is soluble because water molecules are attracted to these polar areas. The bond between carbon and oxygen is not as polar as the bond between hydrogen and oxygen, but it is polar enough that carbon dioxide can dissolve in water.

Iron is attracted by a magnet. This property of iron is used to separate it from a mixture of iron and carbon.

Carbon disulphide is a suitable solvent for sulphur. Sodium chloride remains undissolved and can be separated by filtration process.

Sublimation is the process which is used to separate the mixture of camphor and salt. Camphor gets directly converted to its gaseous state, leaving the salt behind.

Sulphur dissolves in carbon disulphide whereas sugar remains undissolved. Hence, a mixture of sulphur and sugar can be separated using carbon disulphide as solvent.

Iodine sublimes on heating and salt will be left behind in the china dish. 

Chromium does not have magnetic properties so it cannot be separated by magnetic separation.

Magnetic separation is a process in which magnetically susceptible material is extracted from a mixture using a magnetic force. This separation technique can be useful in mining iron as it is attracted to a magnet.