Mon - Fri: 9:00 - 17:00

Mon - Fri: 9:00 - 17:00

We are open to visit

Chemistry Past Questions For JAMB/WAEC/NECO Students v4

Chemistry Past Questions For JAMB/WAEC/NECO Students v4; These Chemistry questions are for students who are sitting for the following examinations:


  • JAMB
  • Post-UTME / Post-JAMB
  • WAEC
  • NECO


Good Job

Try again

#1. The size (diameter) of five elements are in the order R < T < W < X < Y, Y being the largest. If each atom has an electron situated on its circumference, and neglecting other factors, which of the atoms will lose its electron most reluctantly? Options

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

#3. Which of the following changes is physical?

#4. A solid X when heated gives off a brown gas. If X is soluble in excess sodium hydroxide solution but insoluble in excess ammonium hydroxide solution, then X is

#5. Consider the solubility curves of three salts X, Y and Z given in the diagram. If each solution of the salt contains 200 g, and is heated to 100oC, which solution or solutions will deposit 100 g of the solute when suddenly cooled to 0oC?

#6. An experiment test of the Law of conservation of Mass is illustrated in the diagram. In practice, the flask is weighed before and after reaction between solutions X and Y. Which of the following pairs of solutions will be unsuitable for the experiments

#7. Five compounds R,T,W,X and Y form the following compounds: a basic hydride R.H, an acidic hydride YH, atmospheric oxide W2O3, XO2. which of the elements is an alkali

#8. 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

#9. 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

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

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

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

#13. 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

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

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

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

#17. 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

#18. 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

#19. 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

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

#21. An example of an alcohol is

#22. The nucleus of an atom contains

#23. Hypochlorous acid is used as a bleach because

#24. The normal boiling point of a liquid is defined as

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

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

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

#28. Which of the following reactions does not take place in the smelting of iron in a blast furnace?

#29. When ammonia and hydrogen ion bond together to form ammonium ion, the bond formed is called

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

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

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

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

#34. 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?

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

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

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

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

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

#40. 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

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

#42. The oxidation state of chlorine in potassium chlorate is

#43. 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;

#44. Zinc Oxide is a

#45. When sodium chloride and metallic sodium are each dissolved in water

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

#47. 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?


Practice other questions here

Practice other Chemistry questions here

Share This :