Waec Chemistry Past Questions and Answers

Question 1701:

• WAEC 2021

Which of the following pairs of molecules form hydrogen bonds?

A. C${}_2$H${}_5$OH and CH${}_3$OH
B. CH${}_3$OH and H${}_2$
C. H${}_2$S and CH${}_4$
D. NH${}_3$ and SO${}_2$

Question 1702:

• WAEC 2021

Which of the following statements about elements in Group VII is correct?

A. Br${}_2$ will oxidize CI${}^{-}$
B. F${}_2$ has the least tendency to be reduced
C. Cl${}_2$ will oxidize I${}^{-}$
D. L${}_2$ is a stronger oxidizing agent than F${}_2$

Question 1703:

• WAEC 2021

Electrovalent compounds normally ____________

A. Have low boiling points
B. Have mobile electrons
C. Conduct electricity in the solid state
D. Dissolve in polar solvent

Question 1704:

• WAEC 2021

A coordinate covalent bond could be formed between

A. NH${}_3$ and PC/${}_3$
B. BC/${}_3$ and A/C/${}_3$
C. BC/${}_3$ and NH${}_3$
D. H${}^{+}$ and A/C/${}_3$

Question 1705:

• WAEC 2021

Student X titrated 25 cm${}^3$ of Na${}_2$CO${}^3$ with 0.1 mol dm${}^{-3}$ HCI, using methyl orange as indicator. Student Y carried out the same exercise but used phenolphthalein as an indicator. Which of the following statements about the titration is true?

A. Hydrogen chloride gas was released in the reactions in both titrations
B. The titer values obtained from the titration are equal
C. The tirer value obtained by X is twice that of Y
D. The titer value obtained by Y is twice that of X