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 1561:

  

  Which of the structural forms above is ethanoic acid is

  Options:
  A) A
  B) B
  C) C
  D) D
  E) E
  Show Answer
  The correct answer is E .
• Question 1562: In an electrolytic set-up to protect iron from corrosion, the iron is? Options:
  A) made cathode
  B) made anode
  C) used with a metal of lower electropositive potential
  D) initially coated with tin
  Show Answer
  The correct answer is D .
• Question 1563: Which of the following compounds and elements would sublime on exposure to the atmosphere? Options:
  A) Ice
  B) Sulphur
  C) Phosphurous
  D) Iodine
  E) Potassium iodie
  Show Answer
  The correct answer is D .
• Question 1564:

  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 1565:

  

  In the diagram above, X is the

  Options:
  A) Enthalphy
  B) Activated complex
  C) Activation energy
  D) Enthalphy change
  Show Answer
  The correct answer is D .
• Question 1566: Water molecule can be ligands especially when they are bonded to Options:
  A) alkaline earth metals
  B) alkali metals
  C) transition metals
  D) group VII elements
  Show Answer
  The correct answer is C .
• Question 1567: Which of the following ions require the largest quantity of electricity for discharge at an electrode? Options:
  A) 2.0 mole of Q ³⁺
  B) 2.5 mole of R²⁺
  C) 4.0 mole of Y^-
  D) 3.0 mole of T^-
  Show Answer
  The correct answer is A .
• Question 1568: The experiment that showed that atoms have tiny positively charged nucleus was first carried out by Options:
  A) Moseley
  B) Rutherford
  C) Millikan
  D) Dalton
  Show Answer
  The correct answer is B .
• Question 1569: A phenomenon where an element exist in different forms in the same physical state is known as Options:
  A) isomerism
  B) amorphism
  C) allotropy
  D) isotopy
  Show Answer
  The correct answer is C .
• Question 1570: An element, E, has the electronic configuration 1s²2s²2p⁶3s²p³. The reaction of E with a halogen X can give? Options:
  A) EX₃ and EX₅
  B) EX₃ only
  C) EX₅ only
  D) EX₂ and EX₃
  Show Answer
  The correct answer is A .