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 1651: Which of the following results in the fall of acid rain Options:
  A) oxide of lead
  B) particulate matter
  C) oxides of carbon
  D) gaseous hydrocarbon
  Show Answer
  The correct answer is C .
• Question 1652:

  

  Use the diagram to answer this question.

  The gas that can be used to demonstrate the experiment is

  Options:
  A) hydrogen chloride
  B) hydrogen sulphide
  C) nitrogen(ll) oxide
  D) dinitrogen (l) oxide
  Show Answer
  The correct answer is A .
• Question 1653:

  Which of the following is a common laboratory indicator for bases?

  Options:
  A) Methyl orange
  B) Phenolphthalein
  C) Bromothymol blue
  D) Litmus
  Show Answer
  The correct answer is B .
• Question 1654:

  When a solid substance disappears completely as a gas on heating, the substance is said to have undergone?

  Options:
  A) Sublimation
  B) Crystallization
  C) Distillation
  D) Evaporation
  Show Answer
  The correct answer is A .
• Question 1655: The number of electronic shells contained in an atom with electron configuration 1s²2s²2p⁶3s²3p⁶4s² is Options:
  A) 3
  B) 2
  C) 4
  D) 5
  Show Answer
  The correct answer is C .
• Question 1656:

  How many grams of methylacetylene (propyne) CH₃ - C Ξ CH will completely discharge the colour of 8g of bromine?

  (Br = 80, C = 12, H = 1)

  Options:
  A) 0.5
  B) 1.0
  C) 2.0
  D) 3.0
  E) 4.0
  Show Answer
  The correct answer is B .
• Question 1657: Sugar is separated from its impurities by Options:
  A) precipitation
  B) crystallization
  C) distillation
  D) evaporation
  Show Answer
  The correct answer is B .
• Question 1658:

  Neutrons were discovered by?

  Options:
  A) James Chadwick
  B) Ernest Rutherford
  C) J.J Thompson
  D) John Dalton
  Show Answer
  The correct answer is A .
• Question 1659:

  The heat of reaction can be determined experimentally using a device called a

  Options:
  A) Calorimeter
  B) Barometer
  C) Spectrometer
  D) Thermometer
  Show Answer
  The correct answer is A .
• Question 1660: How many moles HCL will be required to react with potassium heptaoxodichromate (VI) to produce 3 moles of chlorine? Options:
  A) 14
  B) 12
  C) 11
  D) 10
  Show Answer
  The correct answer is A .