CHEMISTRY PAPER 3 CONFIDENTIAL - LANJET JOINT MOCK EXAMINATION 2019

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CHEMISTRY PRACTICAL
CONFIDENTIAL
Instruction to schools,

  • No one should have access to this paper except teacher in charge of Chemistry.
  • Great care must be taken to ensure the information herein does not reach the candidate either directly or indirectly.

In addition to fittings and chemical found in chemistry lab, each candidate will require the following;

  1. 120cm3of solution A
  2. 90cm3 of solution B
  3. 90cm3 of solution C
  4. 40cm3 of solution D
  5. 40cm3 of solution
  6. 40cm3 of starch
  7. About 0.5g of solid F
  8. About 1g of solid G
  9. About 0.5g of solid NaHCO3
  10. About 500cm3g distilled water
  11. One 25ml pipette
  12. One 50ml burette
  13. One stopwatch
  14. Two 250ml conical flask
  15. Six dry test tubes in a rock
  16. Two boiling tube.
  17. One metallic spatula
  18. Two measuring cylinder
  19. Two filler paper
  20. Four labels

Access to;

  1. Bunsen burner
  2. Phenolphthalein indicator supplied with a dropper.
  3. 2m hydrochloric acid supplied with a dropper
  4. 1m sodium sulphate supplied with a dropper
  5. 2m sodium hydroxide supplied with a dropper
  6. Acidified potassium manganate vii supplied with a dropper
  7. Freshly prepared bromine water supplied with a dropper. 

Preparation

  • Solution A is made of dissolving 10.08g of oxalic acid in water to make 1l solution.
  • Solution B is made of dissolving 8g of sodium hydroxide pellets in 500cm3 of distilled water, shake and………….. then it up to 1L using 1000ml volumetric flask.
  • Solution C is made by dissolving 33.2g of potassium iodide and make 1L of solution.
  • Solution D is made of dissolving 49.63g of sodium thiasulphate and make it to 1L.
  • Solution E is 20volume hydrogen peroxide.
  • Starch indicator is made of placing 10g of starch in about 500cm3 of warm water and diluting to one liter of solution.
  • Solid F is 1g of Ba(OH)2 8H2O .
  • Solid G is 0.5g malleic acid
  • Acidified potassium manganate vII is prepared by dissolving 3.2g of potassium manganate VII in 200cm3 of 2MH2SO4 and topping it up to 1L using distilled water.

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