The pH of four solutions W, X, Y, Z are 4, 6, 8, 10 respectively, therefore
- A. none of these solutions is acidic
- B. the pH of Y is made more acidic by addition of distilled water
- C. Z is the most acidic solution
- D. W is the most acidic solution
- E. X is neutral
When large hydrocarbon molecules are heated at high temperature in the presence of a catalyst to give smaller molecules, the process is known as
- A. disintegration
- B. polymerization
- C. cracking
- D. degradation
- E. distillation
When heat is absorbed during a chemical reaction, the reaction is said to be
- A. thermodynamic
- B. exothermic
- C. isothermal
- D. endothermic
- E. thermostatic
When air which contains the gases Oxygen, nitrogen, carbondioxide, water vapour and the rare gases, is passed through alkaline pyrogallol and then over quicklime, the only gases left are?
- A. nitrogen and carbondioxide
- B. the rare gases
- C. nitrogen and oxygen
- D. nitrogen and the rare gases
- E. nitrogen, carbondioxide and the rare gases
The oxidation state of chlorine in potassium chlorate is?
- A. +1
- B. +2
- C. +3
- D. +5
- E. +7
An element X forms the following compounds with chlorine; XCl4, XCl3, XCl2. This illustrates the
- A. law of multiple proportions
- B. law of chemical proportions
- C. law of simple proportions
- D. law of conservation of mass
- E. law of definite proportions
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
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
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
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
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
Zinc Oxide is a?
- A. Basic Oxide
- B. Acidic Oxide
- C. Amphoteric Oxide
- D. Neutral Oxide
- E. Reactive Oxide
Which of the following statements is NOT correct?
- A. The average kinetic energy of a gas is directly proportional to its temperature
- B. At constant temperature, the volume of a gas increases as the pressure increases
- C. The pressure of a gas is directly proportional to the density.
- D. The temperature of a gas is directly proportional to its volume