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 471: POlyvinyl chloride is used to produce Options:
  A) bread
  B) pencils
  C) ink
  D) pipes
  Show Answer
  The correct answer is D .
• Question 472: Aluminium hydroxide is used in the dyeing industry as a Options:
  A) Salt
  B) Dye
  C) Mordant
  D) Dispersant
  Show Answer
  The correct answer is C .
• Question 473: Which of the following salts will turn blue litmus red? Options:
  A) Sodium tetrahydroxozincate (ll)
  B) Potassium hydrogentetraoxosulphate (lV)
  C) Sodium trioxocarbonate (lV)
  D) Zinc chloride hydroxide
  Show Answer
  The correct answer is B .
• Question 474: A particle that contains a protons, 10 neutrons and 10 electrons is Options:
  A) positive ion
  B) neutral atom of a metal
  C) neutral atom of a non-metal
  D) negative ion
  Show Answer
  The correct answer is D .
• Question 475: Chlorine gas turns a damp starch-iodide paper Options:
  A) pink
  B) colourless
  C) red
  D) dark blue
  Show Answer
  The correct answer is D .
• Question 476: Proteins in acid solution undergo Options:
  A) Polymerization
  B) Substitution
  C) Fermentation
  D) Hydrolysis
  Show Answer
  The correct answer is D .
• Question 477:

  X + Y → Z. The rate equation for the chemical reaction above is ((-Δ[x])/Δt) = K[X]²[Y].

  The overall order of the reaction is

  Options:
  A) 0.0
  B) 1.0
  C) 2.0
  D) 3.09
  Show Answer
  The correct answer is D .
• Question 478: Copper is displaced from the solution of its salts by most metals because it Options:
  A) is a transition element
  B) is at the bottom of the activity series
  C) is very reactive
  D) has completely filled 3d-orbitals
  Show Answer
  The correct answer is B .
• Question 479: The alloy duralumin is used for the building of aeroplanes because it? Options:
  A) asborbs heat readily from sure thereby preventing the inside of the plane from getting cold at high attitudes
  B) reflects sunlight readily, thereby keeping the inside of the plane cool
  C) is extremely durable and possesses reflective ability
  D) is easily the lightest building material
  E) possesses both strenght and lightness
  Show Answer
  The correct answer is E .
• Question 480:

  Which of the following are mixtures?

  i. Petroleum
  ii. Rubber latex
  iii. Vulcanizer's solution
  iv. Carbon (II) sulphide

  Options:
  A) i, ii and iii
  B) i, ii and iv
  C) i and ii only
  D) i and iv
  Show Answer
  The correct answer is A .