Homework Practice

Printable assignment

Separation Lab: Choose the Right Technique

Section A: Crystallisation, Distillation and Sublimation

Question 1mcq

Crystallisation is useful for:

A.Purifying a solid from solution

B.Separating two gases only

C.Making a suspension stable

D.Measuring mass directly

Question 2mcq

Impure copper sulphate can be purified by:

A.Crystallisation

B.Handpicking only

C.Coagulation only

D.Magnetism only

Question 3mcq

Distillation separates liquids based mainly on difference in:

A.Colour

B.Shape

C.Magnetism

D.Boiling points

Question 4mcq

To obtain water from salt water, a suitable method is:

A.Sublimation

B.Filtration only

C.Handpicking

D.Simple distillation

Question 5mcq

Which substance can be separated by sublimation?

A.Ammonium chloride

B.Sugar solution

C.Common salt

D.Sand

Question 6mcq

A mixture of ammonium chloride and salt can be separated because ammonium chloride:

A.Sublimes on heating

B.Turns into water

C.Dissolves only in oil

D.Is magnetic

Section B: Chromatography, Centrifugation and Coagulation

Question 7mcq

Paper chromatography is commonly used to separate:

A.Salt from seawater only

B.Dyes in ink

C.Iron nails from sand

D.Large stones from rice

Question 8mcq

In paper chromatography, components separate because they:

A.Have same colour always

B.Are all magnetic

C.Move at different rates on paper

D.Do not dissolve at all

Question 9mcq

Centrifugation separates components by:

A.Slow cooling only

B.Rapid spinning

C.Using a magnet always

D.Direct solid-to-gas change

Question 10mcq

Cream can be separated from milk using:

A.Sublimation

B.Centrifugation

C.Crystallisation only

D.Handpicking

Question 11mcq

Coagulation helps in water treatment because it:

A.Makes all particles invisible

B.Removes all dissolved salts by boiling

C.Makes fine particles clump together

D.Turns water into gas

Question 12mcq

Which method is best for separating tea leaves from prepared tea?

A.Filtration

B.Distillation

C.Sublimation

D.Chromatography