Waec Chemistry 2011 Past Questions and Answers

Question 21:

• WAEC 2011

The number of atoms in one mole of a substance is equal to the

A. Mass number
B. Oxidation number
C. Atomic number
D. Avogadro number

Question 22:

• WAEC 2011

Which of the following statements about a molar solution is correct? it

A. Is a supersaturated solution
B. Cannot dissolve more of the solute at that temperature
C. Contains any amount of solute in a given volume of solution
D. Contains one mole of the solute in 1 dm³ of solution

Question 23:

• WAEC 2011

A gas that is collected by upward delivery is likely to be

A. Heavier than air
B. Insoluble in water
C. Lighter than air
D. Soluble in water

Question 24:

• WAEC 2011

Bubbling excess carbon (IV) oxide into calcium hydroxide solution results in the formaton of

A. CaO
B. Ca(HCO₃)₂
C. H₂CO₃
D. CaCO₃

Question 25:

• WAEC 2011

The equation P = \(\frac{K}{V}\) illustrates

A. Boyle's law
B. Charles' law
C. Dalton's law
D. Gay Lussac's law