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 2231: A red precipitate of copper (I) carbide is formed when ammonium solution of copper (I) chloride is introduced into Options:
  A) CH₂ = CH - CH₂ - CH₃
  B) CH₃ CH₂ - C ≡ CH
  C) CH₃ CH₂ CH₂ CH₃
  D) CH₃ - C C - CH₃
  Show Answer
  The correct answer is B .
• Question 2232: The reaction between ethanoic acid and sodium hydroxide is an example of Options:
  A) esterification
  B) neutralization
  C) hydroxylation
  D) hydrolysis
  Show Answer
  The correct answer is B .
• Question 2233: By means of filtration, one component can be obtained pure from an aqueous mixture of sodium chloride and Options:
  A) potassium nitrate
  B) sand
  C) lead nitrate
  D) sugar (glucose)
  E) starch
  Show Answer
  The correct answer is B .
• Question 2234: How many moles of (H+) are there in 1 dm³ of 0.5 M solution of H₂SO₄? Options:
  A) 2.0 moles
  B) 1.0 moles
  C) 0.5 mole
  D) 0.25 mole
  Show Answer
  The correct answer is B .
• Question 2235: How many unpaired electron are in the p-orbitals of a fluorine atom? Options:
  A) 3
  B) $0$
  C) 1
  D) 2
  Show Answer
  The correct answer is C .
• Question 2236: In which of the following reactions has the oxidation number of nitrogen increased? Options:
  A) 2NO_(g) + Br_2(l) → 2NOBr_(l)
  B) 2NO_(g) + O_2(g) → 2NO_2(g)
  C) FeSO_4(aq) + NO_(g) → Fe(NO)SO_4(s)
  D) 2NO(g) + Cl_2(g) → 2NOCl(l)
  Show Answer
  The correct answer is B .
• Question 2237: Ethanoic acid is Options:
  A) tribasic
  B) unionizeable
  C) monobasic
  D) dibasic
  Show Answer
  The correct answer is C .
• Question 2238: The oxidation states of chlorine in HOCL, HCLO₃ and HCLO₄ are respectively? Options:
  A) -1, +5, and +7
  B) -1, -5 and 7
  C) +1, +3 and +4
  D) +1, +5 and +7
  Show Answer
  The correct answer is D .
• Question 2239: Which of the following properties is not peculiar to matter? Options:
  A) Kinetic energy of particles increases from solid to gas
  B) Random motion of particles increases from gas to solid
  C) Orderliness of particles increases from gas to liquid
  D) Random motion of particles increases from liquid to gas
  Show Answer
  The correct answer is B .
• Question 2240: Unsaturated organic compounds are identified by decolourization of Options:
  A) silver bromine and potassium tetraoxomanganate (VII) solutions
  B) bromine water and acidified potassium tetraoxomanganate (VII) solution
  C) silver bromide solution and bromine water
  D) bromine water and alkaline potassium tetraoxomanganate (VII) solution
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  The correct answer is B .