Page 82 - Chemistry_Form_2

Chemistry
for Secondary Schools

15. A molecule of a certain gas can be represented by the following diagram:

FOR ONLINE READING ONLY

(a) What is the name of the molecule?
(b) What is the molecular formula of the gas?
(c) What type of bonding holds the atoms of the molecule?
(d) Name other five compounds with this type of bonding.

16. Write the electronic configuration of each of the following species:

(a) Aluminum ion
(b) Magnesium
(c) Chloride ion

(d) Neon

17. Name the following compounds:
(a) MgI (b) CCl (c) FeBr (d) CuI
2 4 2 2
(e) H S (f) K O (g) PCl
2
2
5
18. Calculate the oxidation number of Cr in CrO 2– and Cr O 2– radicals.
4 2 7
19. A compound of sulfur and oxygen is 40.1% sulfur by mass. What is the
empirical formula for the compound? The R.A.M. are S = 32.07 and O = 16.00.

20. Write the chemical formulas of the following compounds:

(a) Sodium hydrogen carbonate
(b) Silver trioxonitrate(V)
(c) Copper(I) oxide

(d) Aluminium tetraoxosulfate(VI)
21. Write down any two different ionic states in each of the following elements:

(a) Fe (b) Cu (c) Pb (d) Mn
22. An atom of element X (atomic number 11) and an atom of element Y
(atomic number 9) combine to form a compound.

(a) Write the formula of the compound.

Student’s Book Form Two 75

01/08/2025 11:20:57
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CHEMISTRY FORM TWO NEW 2025 DUMMY.indd 75