Chemistry Past Questions And Answers
Which of the following statements is correet for a reaction at equilibrium?
- A. All reactions cease to occur
- B. The eaction has gone to completion
- C. The rates of the forward and backward reactions are equal
- D. The amount of product equals the amount of reactants
Which of the following halogens is the most reactive?
- A. F2
- B. Br2
- C. l2
- D. Cl2
A common characteristics of copper and silver in their usage as coinage metals is that they
- A. have high metallic lustre
- B. are not easily oxidized
- C. are easily oxidized
- D. are not easil reduced
The number of hydroxonium ions produced by one molecule of an acid in aqueous solution is its
- A) basicity
- B) acid strength
- C) pH
- D) concentration
The oxidation number of Fe in [Fe(CN)6]3- is
- A. +3
- B. +2
- C. -2
- D. -3
When dissolved in water, NaOH flakes show
- A. An endothermic change
- B. An exothermic change
- C. A slow reaction
- D. A rapid reaction
In the extraction of iron in the blast furnace, limestone is used to?
- A. release CO2 for the reaction
- B. reduce the iron ore
- C. increase the strenght of the iron
- D. remove impurities
Which of these compound is a covalent compound?
- A) ZnS
- B) NaCI
- C) CsCl
- D) SiO2
It can be concluded that gastric juice
- A. contains enzymes
- B. is acidic
- C. is a mixture
- D. has pH value of 7
(a)(1) Define covalent bond.
(ii) Give two properties of covalent compounds
(ii) With the aid of a diagram, show how ammonia molecule is formed
(iv) Illustrate with a diagram the formation of ammonium ion?
(v) What type of bond(s) exist(s) in I. ammonia, H. ammonium ion? (\(_1\)H\(_7\)N)
(b)(i) Write three subatomic particles with their corresponding relative masses. CH\(_2\)OH
(ii) Name the possible states in which water can exist.
(c) (i) State Graham's law of diffusion
(ii) Arrange the following gases, He, CH\(_4\) and N\(_2\) in order of increasing rates of diffusion. Give a reason for the order. [ H = 1, He = 4, C = 12, N = 14 ]
(d) Draw the structures of the following compounds:
(i) 2,3-dimethylbutane;
(ii) 1,4-dibromocyclohexane.
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