SEPARATION OF SUBSTANCES

The process of settling down of particles of a solid in a liquid is

• Sublimation

• Sedimentation

• Filtration

• Decantation

The solubility ____________ with increase in temperature.

• doesn't change

• decreases

• increases

While preparing chapatis, Paheli found that the flour to be used was mixed with wheat grains. Which out of the following is the most suitable method to separate the grains from the flour?

• Threshing

• Sieving

• Winnowing

• Filtration

What is the process that is used to separate grains from stalks called?

• handpicking

• threshing

• sieving

• winnowing

When is the solution saturated?

• No more salt can be dissolved in the amount of water we have taken

• Lot more salt can be added

• You have to add some sugar into the solution

• None of the above

When is the solution saturated?

• No more salt can be dissolved in the amount of water we have taken

• Lot more salt can be added

• You have to add some sugar into the solution

• None of the above

The diagram shows the apparatus for separating soil and water. What are the labelled parts?

• A = distillate, B = filtrate
• A = filtrate, B = residue
• A = residue, B = filtrate
• A = residue, B = distillate

Which separation technique uses the apparatus shown in the diagram?

• filtration

• evaporation

• distillation

• chromatography

What is the boiling point of water?

• 0^oC
• 100^oC
• 80^oC
• 95^oC

Filtration can be used to separate...

• an insoluble solid from a solution
• a soluble solid from a solution
• a dissolved solid from a solution