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 181: When marble is heated to about 1473 K, another white solid is obtained which reacts vigorously with water to give an alkaline solution. The solution contains? Options:
  A) NaOH
  B) KOH
  C) Mg(OH)₂
  D) Zn(OH)₂
  E) Ca(OH)₂
  Show Answer
  The correct answer is E .
• Question 182: The type of bonding in {Cu(NH₃)₄}²⁺ is Options:
  A) coordinate
  B) electrovalent
  C) metallic
  D) covalent
  Show Answer
  The correct answer is A .
• Question 183:

  

  Use the figure above to answer this question. Which of the following is NOT a monomer?

  Options:
  A) A
  B) B
  C) C
  D) D
  Show Answer
  The correct answer is A .
• Question 184: Which of the following results in the fall of acid rain? Options:
  A) Oxides of lead
  B) Particulate matter
  C) Oxides of sulphur
  D) Gaseous hydrocarbon
  Show Answer
  The correct answer is C .
• Question 185:

  

  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 186: Sieving is a technique used to separate mixtures containing solid particles of Options:
  A) small sizes
  B) large sizes
  C) different sizes
  D) the same size
  Show Answer
  The correct answer is C .
• Question 187: Which of the following pollutants is associated with brain damage? Options:
  A) Carbon (ll) oxide
  B) Radioactive fallout
  C) Biodegradable waste
  D) Sulphus (lV) oxide
  Show Answer
  The correct answer is A .
• Question 188:

  C_(s) + H₂O_(g) → H_2(g) + CO_2(g)

  ΔG for the reaction above at 1300k is -43KJ. At this temperature, the reaction is

  Options:
  A) not feasible
  B) at equilibrium
  C) feasible
  D) exothermic
  Show Answer
  The correct answer is C .
• Question 189: One method of driving the position of equilibrium of an endothermic reaction forward is to? Options:
  A) increase temperature at constant pressure
  B) dcrease pressure at constant temperature
  C) cool down the apparatus with water
  D) decreases temperature at constant pressure
  Show Answer
  The correct answer is A .
• Question 190:

  A 'breath test' used by traffic police to check drunken driving uses?

  Options:
  A) Tumeric on filter paper
  B) Silica gel coated with saliva nitrate
  C) Potassium permanganate-sulphuric acid
  D) Potassium dichromatic-sulphuric acid
  Show Answer
  The correct answer is D .