Chemistry Examination Question for Senior Secondary School (SS1)

15. What process is involved in the reaction represented by the following equation?

AlCl₃ + 3H₂O        Al(OH)₃ + 3HCl

(a) dehydration (b) hydrolysis (c) double decomposition  (d) neutralization

16. Consider the reaction represented by the equation below:

xNH₃ + yCl₂          zHCl + N₂

The values of x, y and z are respectively

(a) 2, 4, 6 (b) 3, 2, 4 (c) 2, 3, 6 (d) 3, 2, 6

17. Hardness in water can be removed by adding

(a) copper (II) tetraoxosulphate (VI)           (b) sodium trioxocarbonate (IV) (c) sodium chloride (d) alum

18. X and Y form a salt in which X is a trivalent cation and Y is a bivalent anion. Which of the following equations represents the dissociation of the salt?

(a) XY        X³⁺ + Y^2-

(b) X₃Y₂        3X⁺  + Y^2-

(c) X₂Y₃           2X³⁺ + 3Y^2-

(d) X₂Y₂         2X³⁺ + 2Y^2-

19. N is formed form NH₃ and H⁺ by

(a) covalent bonding (b) dative bonding      (c) hydrogen bonding   (d) ionic bonding

20. The purity of a solid sample can best be determined by its:

(a) boiling point (b) melting point               (c) conductivity (d) solubility

21. The separation of petroleum fraction depends on the difference in their

(a) melting point (b) molar masses             (c) solubilities (d) boiling points

22. Which of the following bond types is responsible for the high boiling point of water?

(a) metallic bond (b) covalent bond (c) ionic bond (d) hydrogen bond

23. Which of the following elements is diatomic?

(a) sodium (b) oxygen (c) iron (d) neon