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 1571: The pollutants that are likely to be present in an industrial environment are? Options:
  A) H₂S,SO₂ and oxides of nitrogen
  B) NH₃, HCI and CO
  C) CO₂, NH₃ and H₂S
  D) dust, NO and CI₂
  Show Answer
  The correct answer is A .
• Question 1572:

  What process would coal undergo to give coal gas, coal tar, ammoniacal liquor and coke?

  Options:
  A) Steam distillation
  B) Destructive distillation
  C) Liquefication
  D) Hydrolysis
  Show Answer
  The correct answer is B .
• Question 1573: A sample of hard water contains some calcium sulphate and calcium hydrogen carbonate. The total hardness may therefore be removed by Options:
  A) boiling the water
  B) adding excess calcium hydroxide
  C) adding a calculated amount of calcium hydroxide
  D) adding sodium carbonate
  E) adding magnesium hydroxide
  Show Answer
  The correct answer is D .
• Question 1574: The drying agent suitable for drying ammonia is Options:
  A) Calcium Chloride
  B) Calcium Oxide
  C) Phosphorus(V) Oxide
  D) Concentrated H₂SO₄
  Show Answer
  The correct answer is B .
• Question 1575: An increase in temperature causes an increase in the pressure of a gas because there is an increase in the? Options:
  A) average velocity of the molecules
  B) number of collisions between the molecules
  C) density of the molecules
  D) free mean path between each molecules and other
  Show Answer
  The correct answer is B .
• Question 1576: The process that requires the use of hardwater in its operation is Options:
  A) Tanning
  B) Bottling
  C) Laundry
  D) Dyeing
  Show Answer
  The correct answer is B .
• Question 1577: A few drops of NaOH solution was added to an unknown salt forming a white precipitate which is insoluble in excess solution. The cation likely present is Options:
  A) Zn²⁺
  B) Pb²⁺
  C) Ca²⁺
  D) Al³⁺
  Show Answer
  The correct answer is C .
• Question 1578: Which of the following ion’s requires the quantity of electricity for discharge at an electrode Options:
  A) 2.0 mole of Q3⁺
  B) 2.5 mole of R2⁺
  C) 3.0 mole of T^-
  D) 4.0 mole of Y^-
  Show Answer
  The correct answer is A .
• Question 1579: Coal gas is made up of carbon (II) oxide, hydrogen and? Options:
  A) nitrogen
  B) air
  C) argon
  D) methane
  Show Answer
  The correct answer is D .
• Question 1580: Which of the following is used in rocket fuels? Options:
  A) HNO₃
  B) CH₃COOH
  C) H₂SO₄
  D) HCl
  Show Answer
  The correct answer is A .