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 261: A metal M displaces zinc from zinc chloride solution. This shows that Options:
  A) M is more electronegative than zinc
  B) Zinc is above hydrogen in the series
  C) M is more electropositive than zinc
  D) Electrons flow from zinc to M
  Show Answer
  The correct answer is C .
• Question 262:

  Which important nitrogen-containing compound is produced in Haber's process?

  Options:
  A) NH${}_3$
  B) NO${}_2$
  C) NO
  D) HNO${}_3$
  Show Answer
  The correct answer is A .
• Question 263: Which of the following hydrocarbons is mainly used as fuel? Options:
  A) Methylene
  B) Ethylene
  C) Methane
  D) Ethyne
  Show Answer
  The correct answer is C .
• Question 264:

  The constituent common to duralumin and alnico is

  Options:
  A) Co
  B) Mn
  C) Al
  D) Mg
  Show Answer
  The correct answer is C .
• Question 265:

  n monosaccharide $\underset{Q}{\stackrel{P}{\rightleftharpoons }}$ polysaccharide -n water.

  In the process above, P and Q respectively represent

  Options:
  A) Condensation and hydrolysis
  B) Fermentation and condensation
  C) Polymerization and hydrolysis
  D) Polymerization and condensation
  Show Answer
  The correct answer is A .
• Question 266: Environmental pollution is worsened by the release from automobile exhausts of Options:
  A) Water vapour
  B) Steam
  C) Smoke
  D) Heavy metals
  Show Answer
  The correct answer is C .
• Question 267: The reddish–brown rust on ion roofing sheets consists of Options:
  A) Fe³ + (H₂O)₆
  B) FeO.H₂O
  C) Fe₂O₃.3H₂O
  D) Fe₃O₄.2H2₂O
  Show Answer
  The correct answer is C .
• Question 268: Given that the molecular mass of iron is 56 and that of oxygen is 16, how many moles of iron(iii)oxide will be contained in 1kg of the compound? Options:
  A) 25.0 moles
  B) 12.5 moless
  C) 6.25 moles
  D) 3.125 moles
  E) 0.625 moles
  Show Answer
  The correct answer is C .
• Question 269: The arrangement of particles in crystal lattices can be studied using Options:
  A) X-rays
  B) $\beta$-rays
  C) $\alpha$-rays
  D) $\gamma$-rays
  Show Answer
  The correct answer is A .
• Question 270: An example of element that can catenate is Options:
  A) bromine
  B) nitrogen
  C) chlorine
  D) carbon
  Show Answer
  The correct answer is D .