Bayero University Kano Chemistry Post Utme Past Questions and Answers

Question 16 :

When water boilers are used for a long period of time, the solid substances left behind as scale are ____________

A. Magnesium trioxosilicate (IV) and rust
B. Magnesium trioxosilicate (IV) and calcium trioxosulphate (VI)
C. Gay and magnesium trioxosilicate (IV)
D. Clay and rust

Question 17 :

The solubility curve shows the variation of solute concentration with ____________

A. Volume
B. Temperature
C. Vapour density
D. Pressure

Question 18 :

Kerosene is commonly used to remove the red colour stain of palm oil from cloth because it ____________

A. Help to spread the oil over a larger surface area
B. Reacts with the oil surface to form an odourless compound
C. Makes the oil to evaporate easily by dissolving it
D. Helps to dilute the oil and reduce its colour

Question 19 :

The gas that is the most dangerous pollutant to human is ____________

A. Sulphur (IV) oxide
B. Carbon (IV) oxide
C. Nitrogen (II) oxide
D. Hydrogen sulphide

Question 20 :

How many moles of limestone will be required to produce 5.6kg of CaO?
[Ca = 4, C = 12, 0 = 16]

A. 0.20mol.
B. 0.10mol.
C. 1.12mol.
D. 0.56mol.