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 61:

  The inherited traits of an organism are controlled by?

  Options:
  A) RNA molecules
  B) Nucleotides
  C) DNA molecules
  D) Enzymes
  Show Answer
  The correct answer is C .
• Question 62: Ethene reacts with hydrogen bromide to give Options:
  A) CH₂Br₂
  B) CH₃CH₂Br
  C) C₂H₂Br₂
  D) CHBr₂
  Show Answer
  The correct answer is B .
• Question 63: The compound that is used as an anaesthetic is Options:
  A) CCl₄
  B) CH Cl₃
  C) CH₂Cl₂
  D) CH₃Cl
  Show Answer
  The correct answer is B .
• Question 64:

  What volume of 0.100M sodium trioxonitrate (V) solution contains 5g of solute.

  [Na = 23, N = 14, O = 16]

  Options:
  A) 1.7 litres
  B) 0.420 litres
  C) 0.588 litres
  D) 2.35 litres
  Show Answer
  The correct answer is C .
• Question 65: What volume of 11.0 M hydrochloric acid must be dilute to obtain 1 dm³ of 0.05 M acid? Options:
  A) 0.05 dm³
  B) 0.10 dm³
  C) 0.55 dm³
  D) 11.0 dm³
  Show Answer
  The correct answer is A .
• Question 66:

  

  The IUPAC nomenclature of the compound above is

  Options:
  A) 4 - ethyloctane
  B) 5 - ethyloctane
  C) 5 - propylheptane
  D) 3 - propylheptane
  Show Answer
  The correct answer is D .
• Question 67:

  

  Use the graph above to answer this question.If the gas is cooled, at what temperature will it start to condense?

  Options:
  A) 125 ^oC
  B) 150^oC
  C) 175^oC
  D) 250^oC
  Show Answer
  The correct answer is B .
• Question 68:

  ¹⁴₆C → X + B

  X in the equation above represents

  Options:
  A) ¹²₆C
  B) ¹²₅B
  C) ¹⁴₇N
  D) ¹³₆C
  Show Answer
  The correct answer is C .
• Question 69: A piece of metal (M) is dissolved in nitric acid and the resulting solution is treated with a small quantity of sodium hydroxide to produce a white precipitate (B) which redissolves on the addition of excess alkali. The precipitate (B)when ignited in a crucible produces the oxide of the metal(m). The METAL M is Options:
  A) Zn
  B) Cu
  C) Al
  D) Au
  E) Ca
  Show Answer
  The correct answer is A .
• Question 70:

  Which of the following gases will rekindle a brightly splint?

  Options:
  A) NO${}_2$
  B) NO
  C) N${}_2$O
  D) CL${}_2$
  Show Answer
  The correct answer is C .