Post Utme Economics Past Questions and Answers

Question 981:

A labile salt dissolved in water can be separated by ____________

A. Evaporation
B. Crystallization
C. Filtration
D. Steam distillation

Question 982:

The atomicity of ozone is ____________

A. 1
B. 2
C. 3
D. 4

Question 983:

The nucleus of an atom is composed of ____________

A. Positively charged protons
B. Negatively charged electrons
C. Neutrons
D. Protons and neutrons

Question 984:

The following are metals except ____________

A. Silicon
B. Tin
C. Lead
D. Chromium

Question 985:

The half-life of an elements is \(12 \mathrm{hrs}\). If the initial mass is \(50 \mathrm{~g}\). What mass will be left after 2 days?

A. \(3,125 \mathrm{~g}\)
B. \(6.25 \mathrm{~g}\)
C. \(12.5 \mathrm{~g}\)
D. \(25 \mathrm{~g}\)