43
Elements P, Q, R, S have 6, 11, 15, 17 electrons respectively, therefore,
- A. P will form an electrovalent bond with R
- B. Q will form a covalent bond with S
- C. R will form an electrovalent bond with S
- D. Q will form an electrovalent bond with S
- E. Q will form a covalent bond with R
44
A small quantity of solid ammonium chloride (NH4Cl) was heated gently in a test tube, the solid gradually disappears to produce two gases. Later, a white cloudy deposit was observed on the cooler part of the test tube. The ammonium chloride is said to have undergone?
- A. distillation
- B. sublimation
- C. precipitation
- D. evaporation
- E. decomposition
45
In the reaction between sodium hydroxide and sulphuric acid solutions, what volume of 0.5 molar sodium hydroxide would exactly neutralise 10cm3 of 1.25 molar sulphuric acid?
- A. 5cm3
- B. 10cm3
- C. 20cm3
- D. 25cm3
- E. 50cm3
46
The periodic classification of elements is an arrangement of the elements in order of their
- A. Atomic Weights
- B. Isotopic Weights
- C. Molecular Weights
- D. Atomic Numbers
- E. Atomic Masses
47
When sodium chloride and metallic sodium are each dissolved in water
- A. both processes are exothermic
- B. both processes are endothermic
- C. the dissolution of metallic sodium is endothermic
- D. the dissolution of metallic sodium is exothermic
- E. the dissolution of sodium chloride is explosive
48
Zinc Oxide is a?
- A. Basic Oxide
- B. Acidic Oxide
- C. Amphoteric Oxide
- D. Neutral Oxide
- E. Reactive Oxide