Chemistry Exam Past Questions and Answers | JAMB, WAEC and NECO

Chemistry is the study of the substances that make up matter. It looks at their properties, how they react with each other, and how these reactions can create new substances.

• Question 1341: The principle of column chromatography is based on th ability of the constituents to Options:
  A) React with the solvent in the column
  B) React with each other in the solvent in the column
  C) Dissolve in each other in the column
  D) Move at different speeds in the column
  Show Answer
  The correct answer is D .
• Question 1342:

  Equal volumes of CO,SO₂, and H₂S were released into a room at the same point and time. Which of the following gives the order of diffusion of the gases to the opposite corner of the room?

  (S = 32, C = 12, O = 16, N = 14, H = 1)

  Options:
  A) CO, SO₂,NO₂,H₂S
  B) SO₂,NO₂,H₂S,CO
  C) CO,H₂S,SO₂,NO₂
  D) CO,H₂S,NO₂,SO₂
  Show Answer
  The correct answer is D .
• Question 1343: Safety matches contain sulphur and? Options:
  A) potassium trioxochlorate (V)
  B) potassium trioxonitrate (V)
  C) charcoal
  D) phosphorus sulphide
  Show Answer
  The correct answer is D .
• Question 1344:

  

  The name of the compound above is

  Options:
  A) acetic acid
  B) propanal
  C) propanol
  D) ethanoic acid
  E) propanoic acid
  Show Answer
  The correct answer is E .
• Question 1345: Chlorine gas turns damp starch-iodide paper Options:
  A) pink
  B) colourless
  C) red
  D) dark blue
  Show Answer
  The correct answer is D .
• Question 1346: Deliquescent substance are used for Options:
  A) Cooling
  B) Wetting
  C) Melting
  D) Drying
  Show Answer
  The correct answer is D .
• Question 1347:

  The following non-metal form acidic oxides with oxygen except?

  Options:
  A) phosphorus
  B) sulphur
  C) carbon
  D) chlorine
  Show Answer
  The correct answer is C .
• Question 1348: What happens when zinc rod is immersed in copper (II) tetraoxosulphate (VI) solution/ Options:
  A) The blue colour of the solution disappears
  B) Electrons flow from copper to zinc
  C) The zinc rod remain undissolved
  D) The copper generate more copper ions
  Show Answer
  The correct answer is A .
• Question 1349:

  Which of the following metals is commonly alloyed with copper to make brass?

  Options:
  A) Iron
  B) Nickel
  C) Aluminum
  D) Zinc
  Show Answer
  The correct answer is D .
• Question 1350: A particle that contains 8 proton, 9 neutrons and 7 electrons could be written as? Options:
  A) O
  B) O⁺
  C) O⁺
  D) O^-
  Show Answer
  The correct answer is B .