Homework Practice

Printable assignment

Separation Lab: Choose the Right Technique

Section A: Crystallisation, Distillation and Sublimation

Question 1mcq

Crystallisation is useful for:

A.Separating two gases only

B.Purifying a solid from solution

C.Measuring mass directly

D.Making a suspension stable

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.Magnetism

C.Shape

D.Boiling points

Question 4mcq

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

A.Filtration only

B.Handpicking

C.Simple distillation

D.Sublimation

Question 5mcq

Which substance can be separated by sublimation?

A.Common salt

B.Ammonium chloride

C.Sugar solution

D.Sand

Question 6mcq

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

A.Sublimes on heating

B.Is magnetic

C.Dissolves only in oil

D.Turns into water

Section B: Chromatography, Centrifugation and Coagulation

Question 7mcq

Paper chromatography is commonly used to separate:

A.Iron nails from sand

B.Large stones from rice

C.Salt from seawater only

D.Dyes in ink

Question 8mcq

In paper chromatography, components separate because they:

A.Are all magnetic

B.Do not dissolve at all

C.Move at different rates on paper

D.Have same colour always

Question 9mcq

Centrifugation separates components by:

A.Direct solid-to-gas change

B.Rapid spinning

C.Slow cooling only

D.Using a magnet always

Question 10mcq

Cream can be separated from milk using:

A.Centrifugation

B.Handpicking

C.Sublimation

D.Crystallisation only

Question 11mcq

Coagulation helps in water treatment because it:

A.Makes all particles invisible

B.Removes all dissolved salts by boiling

C.Turns water into gas

D.Makes fine particles clump together

Question 12mcq

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

A.Distillation

B.Chromatography

C.Filtration

D.Sublimation