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 1151: Which of the following metals does NOT form a stable trioxocarbonate (IV)? Options:
  A) Fe
  B) Al
  C) Zn
  D) Pb
  E) none of the options is correct
  Show Answer
  The correct answer is E .
• Question 1152: Kerosine is commonly used to remove the red colour stain of palm oil from cloths because it Options:
  A) helps to spread the oil over a larger surface area
  B) react with the oil to form an odourless compound
  C) makes the oil evaporate easily by dissolving it
  D) helps to dilute the oil and reduce its colour
  Show Answer
  The correct answer is C .
• Question 1153:

  Methane is prepared in the laboratory by heating a mixture of sodium ethanoate with soda lime. The chemical constituent(s) of soda lime is/are

  Options:
  A) Ca(OH)${}_2$ and NaOH
  B) Na${}_2$CO${}_3$
  C) NaCl
  D) NaOH
  Show Answer
  The correct answer is A .
• Question 1154: Pollution of underground water by metal ions is very likely in the soil that has high Options:
  A) acidity
  B) alkalinity
  C) chloride content
  D) nitrate content
  Show Answer
  The correct answer is B .
• Question 1155: Which of the following chloride would exhibit the least ionic character? Options:
  A) MgCl₂
  B) CaCl₂
  C) LiCl
  D) AlCl₃
  Show Answer
  The correct answer is D .
• Question 1156: The addition of water to calcium oxide leads to? Options:
  A) a physical change
  B) a chemical change
  C) the formation of a mixture
  D) an endothermic change
  Show Answer
  The correct answer is B .
• Question 1157: The partial pressure of oxygen in a sample of air is 452 mm Hg and the total pressure is 780 mm Hg. What is the mole fraction of oxygen? Options:
  A) 0.203
  B) 0.579
  C) 2.030
  D) 5.790
  Show Answer
  The correct answer is B .
• Question 1158: The principle of column chromatography is based on the ability of the constituents to Options:
  A) move at different speeds in the column
  B) dissolve in each other in the column
  C) react with the solvent in the column
  D) react with each other in the column
  Show Answer
  The correct answer is A .
• Question 1159: How many valence electrons are contained in the element represented ³¹₁₅P? Options:
  A) 3
  B) 5
  C) 15
  D) 31
  Show Answer
  The correct answer is B .
• Question 1160:

  C₂H₅ - C = CH₂

  CH₃The correct name of the compound with the above structural formula is

  Options:
  A) 2-methylbut -1-ene
  B) 2-methylbut -2-ene
  C) 2-methylbutane
  D) 2-ethylprop-1 -ene
  E) 2-ethylprop-2-ene
  Show Answer
  The correct answer is A .