Page 81 - Chemistry_Form_2

Chemistry
for Secondary Schools

10. Which of the following sets of symbols represent cations?
(a) K and Mg
+
(b) Mg and Al

(c) Al and Cl –
3+
FOR ONLINE READING ONLY
(d) K and Al 3+
+
11. Identify the chemical formula for potassium chlorate(V).
(a) K ClO (b) K(ClO ) (c) K ClO (d) KClO 3
5
3
2
3 2
3
12. Choose the correct formula for the combination of the following ions:
(i) Mg and PO 4 3–
2+
(a) Mg (PO ) (b) Mg PO (c) Mg (PO) (d) MgPO
3 4 2 2 4 2 3 4
(ii) Ba and N 3–
2+
(a) BaN (b) BaN (c) Ba N (d) Ba N
2 2 3 3 2
(iii) Al and SO 4 2–
3+
(a) AlSO (b) Al (SO ) (c) Al (SO ) (d) Al (SO )
4 4 2 2 4 3 3 4 2
(iv) Zn and C H O
–
2+
2
3
2
(a) ZnC H O (b) Zn C H O (c) Zn(C H O ) (d) Zn (C H O )
2 3 2 2 2 3 2 2 3 2 2 2 2 3 2 2
13. (a) Identify the compounds with the incorrect IUPAC names.
(i) KCl – Potassium chloride
(ii) Fe (SO ) – Iron(II) sulfate(VI)
2
4 3
(iii) CaCl – Calcium dichloride
2
(iv) Na SO – Sodium tetraoxosulfate(VI)
4
2
(b) Rename the incorrectly named compound(s) in (a) using the IUPAC
rules.

14. You are provided with the following list of substances: Mg, MnO , Ca ,
2–
2+
4
Cl, N , Cr O , Al , and H . Which of these substances are:
2–
3+
2
7
2
2
(a) atoms?
(b) molecules?
(c) ions?
(d) radicals?

74 Student’s Book Form Two

01/08/2025 11:20:57
CHEMISTRY FORM TWO NEW 2025 DUMMY.indd 74
CHEMISTRY FORM TWO NEW 2025 DUMMY.indd 74 01/08/2025 11:20:57