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CHEMISTRY TEST

1. A gaseous metallic chloride MClx consists of 20.22% of M by mass. The formula of the chloride is
[M = 27, Cl = 35.5]

 

 

 

 

2. During the electrolysis of copper II sulphate between platinum electrodes, if litmus solution is added to the anode compartment,

 

 

 

 

 

3. The periodic classification of elements is an arrangement of the elements in order of their

 

 

 

 

 

4. An element X forms the following compounds with chlorine; XCl4, XCl3, XCl2. This illustrates the

 

 

 

 

 

5. Which of the following reactions does not take place in the smelting of iron in a blast furnace?  A. CaCO3(s) CaO(s) + CO2(g)  B. C(s) + O2(g) CO2(g)  C. 3FeCO(s) + 2OCO2(g) FeO4(s)  D. SiO2(s) + CaO(s) CaCO3(s)  E. CO2(g) + C(s) 2CO(g)

 

 

 

 

 

6. When large hydrocarbon molecules are heated at high temperature in the presence of a catalyst to give smaller molecules, the process is known as

 

 

 

 

 

7. Which of the following substances would you see as an indicator in the titration of sodium carbonate solution against hydrochloric acid (complete neutralisation)?

 

 

 

 

 

8. The most common type of chemical reaction which alkanes undergo is

 

 

 

 

 

9. In titration involving sodium hydroxide and dilute hydrochloric acid, where would you place the base?

 

 

 

 

 

10. When each of the nitrates of Potassium, Magnesium and iron is heated,

 

 

 

 

 

11. Which of the following changes is physical?

 

 

 

 

 

12.

Which of the following compounds will form a solution if exposed to air?

 

 

 

 

 

13. When heat is absorbed during a chemical reaction, the reaction is said to be

 

 

 

 

 

14. You are provided with five gas jars containing SO2, CO2, H2, CO and NO respectively. Select a test from A to E which will identify ANY ONE of the gases completely

 

 

 

 

 

15.

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?

 

 

 

 

 

16. 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

 

 

 

 

 

17. If 30cm3 of oxygen diffuses through a porous pot in 7 seconds, how long will it take 60cm3 of chlorine to diffuse through the same pot, if the vapour densities of oxygen and chlorine are 16 and 36 respectively?

 

 

 

 

 

18. By means of filtration, one component can be obtained pure from an aqueous mixture of sodium chloride and

 

 

 

 

 

19. Which of the following will have its mass increased when heated in air?

 

 

 

 

 

20. Hypochlorous acid is used as a bleach because

 

 

 

 

 

21. Which of the following is not a member of the homologous series of the paraffins (alkanes)?

 

 

 

 

 

22. Which of the following metals cannot replace hydrogen from water or steam?

 

 

 

 

 

23. Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
From the equation above, the mass of magnesium required to react with 250cm3 of 0.5M HCl is
[Mg = 24]

 

 

 

 

 

24. A sample of hard water contains some calcium sulphate and calcium hydrogen carbonate. The total hardness may therefore be removed by

 

 

 

 

 

25. Three solutions contain carbonate, sulphate and sulphide ions respectively. One test that will identify just ONE of them completely is by addition to each of them of

 

 

 

 

 

26. The oxidation state of chlorine in potassium chlorate is

 

 

 

 

 

27. The pH of four solutions W, X, Y, Z are 4, 6, 8, 10 respectively, therefore

 

 

 

 

 

28. If excess zinc is added to a bluish green solution of copper (II) sulphate, and the excess zinc filtered off after completion of reaction, a colourless solution is obtained because

 

 

 

 

 

29. Which of the following gases will diffuse fastest when passed through a porous plug? [H = 1, C = 12, N = 14, O = 16]

 

 

 

 

 

30. If hydrogen sulphide gas is passed into a solution of a pure iron chloride, a yellow deposit appears. If the deposit is filtered, a pale green solution is left behind. The pale green solution is

 

 

 

 

 

31. An element X forms the following compounds with chlorine; XCl4, XCl3, XCl2. This illustrates the

 

 

 

 

 

32. 56.00cm3 of a gas at S.T.P. weighed 0.11g. What is the vapour density of the gas?
[Molar volume of a gas at S.T.P = 22.4dm3]

 

 

 

 

 

33. Elements P, Q, R, S have 6, 11, 15, 17 electrons respectively, therefore,

 

 

 

 

 

34.

Which of the following statements is NOT correct?

 

 

 

 

 

35. Which of the following gases may not be dried with concentrated sulphuric acid?

 

 

 

 

 

36. The normal boiling point of a liquid is defined as

 

 

 

 

 

37. The nucleus of an atom contains

 

 

 

 

 

38. Brass and bronze are both metallic alloys. Which of the following constituents is common to both alloys?

 

 

 

 

 

39. 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;

 

 

 

 

 

40. A gas jar was inverted over burning yellow phosphorus floating over water in a beaker. After burning, the water level was found to rise in the gas jar. The water level rises because

 

 

 

 

 

41. Which is the temperature of a given mass of a gas initially at 0°C and 9 atm, if the pressure is reduced to 3 atm at constant volume?

 

 

 

 

 

42. 200cm3 each of 0.1M solutions of lead (II) trioxonitrate (V) and hydrochloric acid were mixed. Assuming that lead (II) chloride is completely insoluble, calculate the mass of lead (II) chloride that will be precipitated.
[Pb = 207, Cl= 35.5, N = 14, O = 16

 

 

 

 

 

43. The reaction between an organic acid and an alcohol in the presence of an acid catalyst is known as;

 

 

 

 

 

44. Consider the following equation H2O + 2Fe2+ + Cl2 ↔ 2Fe3+ + 2Cl + H2O. The only ion which behaves as an oxidising agent is

 

 

 

 

 

45. Two gas cylinders contain ethylene (ethene) and acetylene respectively. One test which can be used to distinguish between them is by

 

 

 

 

 

46. The IUPAC names of the compounds CH3COOH and CH2=CH2 are respectively;

 

 

 

 

 

47. When heat is absorbed during a chemical reaction, the reaction is said to be

 

 

 

 

 

48. Zinc Oxide is a

 

 

 

 

 

49. Consider the following exothermic reaction
2SO2(g) + O2(g) ↔ 2SO3(g)
If the temperature of the reaction is reduced from 800°C to 500°C, an no other change takes place, then

 

 

 

 

 

50. When sodium chloride and metallic sodium are each dissolved in water

 

 

 

 

 


Question 1 of 50



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