- 1. 1. The diagram above represents the arrangement of valence electrons in the molecule AB2. Which of the following pairs of electrons could be A and B respectively?
A) Oxygen and hydrogen
B) Nitrogen and oxygen
C) Carbon and oxygen
D) Sulphur and oxygen
- 2. 2. The diagram above represents an atom that can combine with chlorine to form ........
A) An electrovalent bond
B) A co-ordinate bond
C) A covalent bond
D) A hydrogen bond
- 3. 3. The diagram above represents the formation of ...........
A) A covalent bond
B) An electrovalent bond
C) A co-ordinate bond
D) A Metallic bond
- 4. 4. What is the empirical formular of a hydrocarbon containing 0.08 moles of carbon and 0.32 moles of hydrogen?[H=1, C=12, O= 16]
A) CH4
B) CH2
C) CH3
D) C2H4
- 5. 5. An organic compound contains 0.188g carbon, 0.062g hydrogen and 0.25g oxygen. What is the empirical formula of the compound?.[H=1, C=12, O= 16]
A) CH3O
B) CHO
C) CH4O
D) CH2O
- 6. 6. The molecular formula of a compound expresses the ......
A) Ratio of atoms of the different elements in one molecule
B) Number of atoms in one molecule of compound
C) Number of atoms of different elements in one molecule of the compound
D) Simple whole number ratio for the atoms of different elements
- 7. 7. A compound contains 31.91% potassium, 28.93% chlorine, and the rest oxygen, what is the chemical formula of the compound? [K = 39, Cl =35.5, O= 16]
A) KClO3
B) KClO2
C) KClO4
D) KClO
- 8. 8. In any chemical reaction, the total mass of the products is always equal to that of the reactants. This is a statement of the law of ........
A) Constant composition
B) Multiple proportions
C) Reciprocal proportions
D) Conservation of matter
- 9. 9. A hydrocarbon containing 88.9% carbon has the empirical formula ..........[H=1, C=12]
A) CH2
B) C2H3
C) C2H5
D) CH
- 10. 10. Consider the reaction represented by the equation above. The value of x y and z respectively are ........
A) 2, 4 and 5
B) 4, 1 and 2
C) 1,2 and 3
D) 4,2 and 2
- 11. 11. The numerical coefficients in a balanced equation give the .....
A) Number of moles of reactants and products
B) Molar mass of the reactants and products
C) Mass ratio of the reactants
D) Number of molecules and atoms of products only
- 12. 12. If an element X with atomic number 13 combines with an element Y whose atomic number is 8, the most likely formula of the compound formed between X and Y is .....
A) XY2
B) X2Y
C) X3Y2
D) X2Y3
- 13. 13. In the equation above, the value p and x respectively are .......
A) 2 and 3
B) 6 and 2
C) 8 and 2
D) 1 and 3
- 14. 14. 1.20g of an oxide of a metal on reduction, gave 0.960g of metal. Find the equivalent mass of the metal.
A) 32g
B) 21g
C) 24g
D) 18g
- 15. 15. Oxidation number of nitrogen in NO is ......
A) -4
B) +2
C) -2
D) +4
- 16. 16. The sum of the oxidation numbers for a compound is .......
A) Zero
B) Four
C) Two
D) One
E) Three
- 17. 17. The IUPAC system uses -------- in naming compounds.
A) Molar mass
B) No of moles
C) Atomic mass
D) Oxidation numbers
- 18. 18. In radicals or an ion the sum of the oxidation number is equal to its .......
A) Molar mass
B) Atomic number
C) Mole ratio
D) Charge
- 19. 19. What is the oxidation number of manganese in KMNO4?
A) +8
B) -5
C) -7
D) +7
- 20. 20. The combining power of an element is known as .......
A) Mole ratio
B) Valency
C) Atomic number
D) Radicals
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