Separation of mixtures and purification of chemical substances - Jamb Chemistry Past Questions and Answers

Question 86:

• JAMB 2012

l . Evaporation. ll. Sublimation. lll. Diffusion. IV. Brownian motion.
Which of the above can correctly be listed as evidences for the particulate nature of matter?

A. I and lll only
B. Ll and lV only
C. L, ll and lll only
D. L, ll, lll and lV

Question 87:

• JAMB 2012

I. It has a varied composition from one place to another. ll. it constituents can be separated by physical means
lll. It contains unreactive noble gases
which of the above shows that air is a mixture?

A. I and ll only
B. Ll and lll only
C. L and lll only
D. L,lll and lll

Question 88:

• JAMB 2012

A piece of filter paper moistened with lead (ll) ethanoate solution turns black when the paper is dropped into a gas likely to be

A. Sulphur (VI) oxide
B. Hydrogen chloride
C. Sulphur (VI) oxide
D. Hydrogen sulphide

Question 89:

• JAMB 2012

Which of the following gases has a characteristic pungent smell, turns red litmus paper blue and forms dense white fumes with hydrogen chloride gas?

A. N₂
B. N₂O
C. CI₂
D. NH₃

Question 90:

• JAMB 2012

Which of the following compounds will burn with a brick-red colour in a non-luminous Bunsen flame?

A. LiCI
B. NaCl
C. CaClN₂
D. MgClN₂