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 1361: The noble gas, argon,is used for Options:
  A) electric arc welding
  B) welding brass
  C) underwater welding
  D) steel welding
  Show Answer
  The correct answer is A .
• Question 1362:

  When dilute aqueous solutions of lead (II) nitrate and potassium bromide are mixed, a precipitate is observed.

  The products of this reaction are?

  Options:
  A) PbO_(s) + Br^- + KNO₃
  B) Br₂ + NO_2(g) + PbBr_2(s)
  C) PbO_(s) + K⁺_(aq) + Br_(aq) + NO_2(g)
  D) PbBr_2(s) + K_(aq) + K⁺_(aq) + NO_3(aq)
  Show Answer
  The correct answer is D .
• Question 1363: Which of the following is a neutralization reaction? Options:
  A) Addition of sodium chloride solution to potassium chloride solution
  B) Addition of trioxonitrate (V) acid (nitric acid) to distilled water
  C) Addition of trioxonitrate (V) acid (nitric acid) to tetraoxosulphate (IV) acid (sulphuric acid)
  D) Addition of trioxonitrate (V) acid (nitric acid) to potassium trioxonitrate (V) (potassium nitrate) solution
  E) Addition of trioxonitrate (V) acid (nitric acid) to potassium hydroxide solution
  Show Answer
  The correct answer is E .
• Question 1364: Which of the following statements is true about 2-methylpropane and butane Options:
  A) They are members of the same homologous series
  B) They have the same boiling point
  C) They have different number of carbon atoms
  D) They have the same chemical properties
  Show Answer
  The correct answer is A .
• Question 1365:

  Which of the following is used to power steam engines?

  Options:
  A) lubricating oil
  B) coal
  C) bitumen
  D) diesel oil
  Show Answer
  The correct answer is B .
• Question 1366: Water is said to be temporarily hard when it contains Options:
  A) Ca (HCO₃)₂ and Mg (HCO₃)₂ salts
  B) Ca (HCO₃)₂ and CaCO₃ SALTS
  C) Mg(HCO₃)₂ and CaSO₄ salts
  D) CaSO₄ and Ca(HCO₃)₂ salts
  Show Answer
  The correct answer is A .
• Question 1367: The final product of the reaction of ethyne with hydrogen iodine is? Options:
  A) CH₃—CHI₂
  B) CH₂l—CH₂I
  C) CH₃—CI₃
  D) CH₂ = CHI
  Show Answer
  The correct answer is A .
• Question 1368:
  

  In the diagram above, Y is

  Options:
  A) fused CaO
  B) H₂O
  C) NaOH
  D) Concentrated H₂SO₄
  Show Answer
  The correct answer is D .
• Question 1369: The removal of rust from iron by treatment with tetraoxosulphate (IV) acid is based on the? Options:
  A) hydrolysis of the iron
  B) reaction of acid with base
  C) oxidationof the rust
  D) dehydration of the iron
  Show Answer
  The correct answer is D .
• Question 1370:

  How many moles of copper would be deposited by passing 3F of electricity through a solution of copper (II) tetraoxosulpohate (IV)?

  (F = 96 500 C mol^-)

  Options:
  A) 0.5
  B) 1.0
  C) 1.5
  D) 3.0
  Show Answer
  The correct answer is C .