Post Utme Chemistry Past Questions and Answers

Question 466:

If the electron configuration of an element is \(1 s^{2} 2 s^{2} 2 p^{5}\), how many unpaired electrons are there?

A. 2
B. 5
C. 1
D. 4

Question 467:

Oxygen in air can be removed using ____________

A. Slaked lime
B. Caustic soda solution
C. Lime water
D. Pyrogallol solution

Question 468:

A common charlatanistic of copper and silver in their usage as coinage metals is that they ____________

A. Are easily oxidized
B. Are not easily oxidized
C. Have high metallic lustre
D. Are not easily reduced

Question 469:

____________ are allotropes of carbon

A. Graphite and sulphu
B. Amorphous charcoal and coke
C. Diamond and graphite
D. Carbon monoxide and coke

Question 470:

A substance is said to be hygroscopic if it ____________

A. Does not absorb moisture
B. Is suspended in wate
C. Dissolves when it absorbs moistures
D. Hydrolysis in wate