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 1211:

  Consider the reaction

  A${}_{(s)}$ + 2B${}_{(g)}$ → 2C${}_{(aq)}$ + D${}_{(g)}$

  What will be the effect of a decrease in pressure on the reaction?

  Options:
  A) the equilibrium will shift
  B) rate of forward reaction will increase
  C) rate of backward reaction will increase
  D) rates of forward and backward reaction are not affected
  Show Answer
  The correct answer is B .
• Question 1212:

  

  The I.U.P.A.C name for the compound

  Options:
  A) 2-methyl-3-pentene
  B) 4-methyl-2-pentane
  C) 2-methyl-2-pentene
  D) 4-methylpent-2-ene
  E) 2-methyl-3-pentane
  Show Answer
  The correct answer is D .
• Question 1213: Equal moles of ethyne and hydrogen iodide react to give Options:
  A) CH₂ = CH₂
  B) CH₂ - CHI
  C) CH₃ - CI
  D) CH₂ = CHI
  Show Answer
  The correct answer is D .
• Question 1214:

  The contact process is used for the industrial production of

  Options:
  A) sulfuric acid (H2SO4)
  B) Hydrochloric acid (HCl)
  C) Sodium hydroxide (NaOH)
  D) Calcium oxide (CaO)
  Show Answer
  The correct answer is A .
• Question 1215: Which of the following is an example of a mixture? Options:
  A) Common salt
  B) Blood
  C) Sand
  D) Washing soda
  Show Answer
  The correct answer is B .
• Question 1216:

  A dense white fume is formed when ammonia gas reacts with

  Options:
  A) O_2(g)
  B) H_2(g)
  C) Cl_2(g)
  D) HCl_(g)
  Show Answer
  The correct answer is D .
• Question 1217: Hydrogenation may be effected by Options:
  A) the removal of hydrogen from an alkane in the presence of a catalyst
  B) the addition of hydrogen to an alkane in the presence of a catalyst
  C) the addition of hydrogen to an alkyne
  D) the removal of hydrogen from an alkyne
  E) the addition of hydrogen to an ethyl alcohol
  Show Answer
  The correct answer is C .
• Question 1218: The noble gas, argon, is used for Options:
  A) electrical arc welding
  B) welding brass
  C) underwater welding
  D) steel-welding
  Show Answer
  The correct answer is A .
• Question 1219: The reaction of an alkanol with an alkanoic acid in the presence of concentrated H₂SO₄ will produce an? Options:
  A) alkanal
  B) alkanoate
  C) alkanone
  D) alkyne
  Show Answer
  The correct answer is B .
• Question 1220:

  200cm${}^3$ of 0.50mol/dm${}^3$ solution of calcium hydrogen trioxocarbonate (IV) is heated. The maximum weight of solid precipitated is

  Options:
  A) 10g
  B) 25g
  C) 20g
  D) 15g
  Show Answer
  The correct answer is A .