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 1891:

  At 2.0 atm pressure, the volume of a gas is 4.0 L. If the pressure is reduced to 1.0 atm while keeping the temperature constant, what will be the new volume of the gas?

  Options:
  A) 2.0 L
  B) 6.0 L
  C) 8.0 L
  D) 4.0 L
  Show Answer
  The correct answer is C .
• Question 1892:

  Which of the following reactions is (are) feasible?

  I Br ₍₁₎ + 2CI _2(aq) 2Br _(aq) + CI _2(g)

  Ll 21 _(aq) + Br ₂₍₁₎ 2Br _(aq) + 1 _2(s)

  Lll 2F _(aq) + CI _2(g) 2CI _(aq) + F _2(g) IV 2F _(aq) + Br ₂₍₁₎ 2Br _(aq) + F _2(g)

  Options:
  A) l
  B) ll
  C) l and lll
  D) lll and lV
  Show Answer
  The correct answer is B .
• Question 1893:

  What is the name of the process by which ammonia is produced on an industrial scale?

  Options:
  A) Nitrogenation
  B) Ammoniation
  C) Nitrification
  D) Haber process
  Show Answer
  The correct answer is D .
• Question 1894: Some properties of chemical substances are mentioned below... i. sour taste ii. slippery touch iii. yields alkaline gas with ammonium salt iv. has pH less than 7 v. turns phenolphthalein pink.Which of the above are NOT typical properties of alkalis? Options:
  A) i, iv and v
  B) iv and v
  C) i and iv
  D) ii and v
  E) ii, iii and iv
  Show Answer
  The correct answer is C .
• Question 1895:

  Using the metal activity series, the metal that can liberate hydrogen gas from steam is?

  Options:
  A) iron
  B) copper
  C) tin
  D) lead
  Show Answer
  The correct answer is A .
• Question 1896: Which of the following best explains the increase in the rate of a chemical reaction as the temperature rises? Options:
  A) The bonds in the reacting molecules are more readily broken
  B) The molecular collisions become more violent
  C) A lower proportion of the molecules has the necessary minimum energy to react
  D) The collision frequency of the molecules increase
  Show Answer
  The correct answer is D .
• Question 1897: The coloured nature of transition metal ions are associated with their partially filled Options:
  A) f- orbital
  B) s- orbital
  C) p-orbital
  D) d-orbital
  Show Answer
  The correct answer is D .
• Question 1898:

  The mass of one Avogadro number of helium atoms is?

  Options:
  A) 1.00gram
  B) 4.00gram
  C) 8.00gram
  D) 6.00gram
  Show Answer
  The correct answer is B .
• Question 1899: Allotropes are elements having? Options:
  A) different physical but the same chemical properties
  B) different chemical but the same physical properties
  C) the same chemical and physical properties
  D) different atomic structure
  E) the same position in the periodic table
  Show Answer
  The correct answer is A .
• Question 1900:

  

  The compound above contains

  Options:
  A) Sp ³ hybridized carbon atoms only
  B) Sp ² hybridized carbon atoms only
  C) Sp ³ and Sp hybirdized carbon atoms
  D) Sp ³ and Sp ²
  Show Answer
  The correct answer is D .