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 521: Which of the activities is commonly used as a nuclear fuel Options:
  A) uranium
  B) palladium
  C) actium
  D) thorium
  Show Answer
  The correct answer is A .
• Question 522: The chlorinated alkane often used industrially to remove grease is Options:
  A) tetrachloromethane
  B) chloromethane
  C) trichloromethane
  D) dichlorometane
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  The correct answer is A .
• Question 523:

  N${}_2$O${}_4$⇔ 2NO${}_2$ ( = -ve)

  From the reaction above, which of these conditions would produce the highest equilibrium yield forN${}_2$O${}_4$?

  Options:
  A) Low temperature and high pressure
  B) Low temperature and low pressure
  C) high temperature and low pressure
  D) high temperature and high pressure
  Show Answer
  The correct answer is A .
• Question 524: Sodium carbonate crystals on exposure to a dry atmosphere change to a white powder. This phenomenon is known as? Options:
  A) deliquescence
  B) hygroscopy
  C) oxidation
  D) efforescence
  E) sublimation
  Show Answer
  The correct answer is D .
• Question 525: How many grams of bromine will be required to completely react with 10 g of propyne?(C = 12, H = 1, Br = 80) Options:
  A) 20 g
  B) 40 g
  C) 60 g
  D) 80 g
  Show Answer
  The correct answer is D .
• Question 526: An example of oxidation - reduction enzyme is Options:
  A) amylase
  B) protease
  C) lipase
  D) dehydrogenase
  Show Answer
  The correct answer is D .
• Question 527: Which of these is an acid salt? Options:
  A) K₂SO_4-.AI₂(SO₄)₃.24H₂O
  B) CuCO₃.Cu(OH)₂
  C) NaHS
  D) CaOCI_2-
  Show Answer
  The correct answer is C .
• Question 528:

  Which separation technique is used to separate different pigments in a mixture based on their affinity for a stationary phase and a mobile phase?

  Options:
  A) Chromatography
  B) Filtration
  C) Decantation
  D) Distillation
  Show Answer
  The correct answer is A .
• Question 529: Which of the following compounds can exist as geometric isomers? Options:
  A) 2-methylbut-2ene
  B) But-2-ene
  C) But-1-ene
  D) CI-C-Br
  Show Answer
  The correct answer is B .
• Question 530: When calcium oxide is heated with carbon, the oxide will Options:
  A) be converted to carbide
  B) be converted to the trioxocarbonate (IV) salt
  C) decompose to the metal
  D) melt,producingg carbon (IV) oxide
  Show Answer
  The correct answer is A .