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 2001:

  

  The solubility curves of four substances are shown in the figure above. Which of the four substances would crystallize from a saturated solution cooled from 353K(80^oC)to 323K(50C)?

  Options:
  A) P and Q
  B) P and R
  C) P and S
  D) R and S
  E) Q and R
  Show Answer
  The correct answer is D .
• Question 2002: The air pollutant unknown in nature is Options:
  A) NO
  B) CO
  C) HCHO
  D) DDT
  Show Answer
  The correct answer is C .
• Question 2003:

  

  In the diagram above, the curve that represents the production of oxgyen gas from the decomposition of KCIO₃ in the presence of MnO₂ catalyst is

  Options:
  A) R
  B) P
  C) S
  D) Q
  Show Answer
  The correct answer is B .
• Question 2004:

  In the preparation of salts, the method employed will depend on the?

  Options:
  A) composition
  B) dissociating ability
  C) stability to heat
  D) precipitating ability
  Show Answer
  The correct answer is C .
• Question 2005: A suitable reagent for distinguishing between ethanoic acid ethanol is Options:
  A) bromine water
  B) Fehling's solution
  C) sodium hydrogentrioxocarbonate (IV)
  D) ammoniacal silver trioxonitrate (V)
  Show Answer
  The correct answer is C .
• Question 2006:

  

  Use the above option to answer this question. The dehydration of ammonium salt of alkanoic acids produces a compound with the general formula

  Options:
  A) A
  B) B
  C) C
  D) D
  Show Answer
  The correct answer is B .
• Question 2007: 0.07g of a hydride of carbon occupies 56.0cm³ at S.T.P. when vaporized and contains 14.29% by mass of hydrocarbon is(C = 12, H = 1) Options:
  A) CH₄
  B) C₂H₂
  C) C₂H₄
  D) C₂H₆
  E) C₃H₈
  Show Answer
  The correct answer is C .
• Question 2008:

  The Consecutive members of an alkane homologous series differ by

  Options:
  A) CH
  B) CH${}_2$
  C) CH${}_3$
  D) C${}_n$H${}_n$
  Show Answer
  The correct answer is B .
• Question 2009: The products of the combustion of candle wax are Options:
  A) hydrogen and water
  B) oxygen and water
  C) carbon (IV) oxide and water
  D) carbon (II) oxide and water
  Show Answer
  The correct answer is C .
• Question 2010: The label on a reagent bottle containing a clear organic liquid dropped off.The liquid was neutral to litmus and gave a colourless gas with metallic sodium. The liquid must be an? Options:
  A) alkanoate
  B) alkaene
  C) alkanol
  D) alkane
  Show Answer
  The correct answer is C .