Chemistry 2017 Waec Past Questions and Answers

Question 31 :

• WAEC 2017

Halogens generally react with metals to form

A. Alkalis
B. Acids
C. Bases
D. Salts

Question 32 :

• WAEC 2017

Potassium Chloride solid does not conduct electricity because

A. It is a covalent compound
B. Strong cohesive forces make its ions immobile
C. Strong cohesive force makes its molecule immobile
D. Each of potassium and chlorine structures contain noble gas structure

Question 33 :

• WAEC 2017

When water was added to a white anhydrous substance X, the colour changed to blue. X is

A. \(CuSO_{4}\)
B. \(FeSO_{4}\)
C. \(Na_{2}SO_{4}\)
D. \(PbSO_{4}\)

Question 34 :

• WAEC 2017

Solubility curve can be used in the determination of the

A. Amount of crystals formed
B. Amount of solvent that can be recovered
C. Amount of solid drugs in a given solution
D. Temperature of the solution

Question 35 :

• WAEC 2017

If 0.2g of a salt is required to saturate 200\(cm^{3}\) of water at room temperature, what is the solubility of the salt?

A. 0.2\(gdm^{-3}\)
B. 1.0\(gdm^{-3}\)
C. 2.0\(gdm^{-3}\)
D. 5.0\(gdm^{-3}\)