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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:

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

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#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?

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