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 891: The approximate volume of air containing 10cm³ of oxygen is? Options:
  A) 20 cm³
  B) 25 cm³
  C) 50 cm³
  D) 100 cm³
  Show Answer
  The correct answer is C .
• Question 892: A cracking process in petroleum refining can be represented by Options:
  A) heptane to heptene
  B) heptane to 3-methylhexane
  C) heptane to propene and butane
  D) heptane to 2,3,3-trimethybutane
  Show Answer
  The correct answer is C .
• Question 893:

  

  Which of the following functional groups will give gas bubbles when treated with a saturated solution of sodium hydrogen trioxocarbonate (IV)?

  Options:
  A) A
  B) B
  C) C
  D) D
  Show Answer
  The correct answer is B .
• Question 894: Fluorine does not occur in the free state in nature because Options:
  A) it is a poisonous gas
  B) it belongs to the halogen family
  C) it is inert
  D) of its high reactivity
  Show Answer
  The correct answer is D .
• Question 895: Stainless steel is an alloy of? Options:
  A) Iron, carbon and silver
  B) iron, carbon and lead
  C) iron, carbon and chromium
  D) iron and carbon only
  Show Answer
  The correct answer is C .
• Question 896:

  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 897:

  How many atoms are present in 6.0g of magnesium? [Mg = 24, N.A = 6.02 x 10 ${}^{23}$mol]

  Options:
  A) 1.20 x 10${}^{22}$
  B) 2.4 x 10${}^{22}$
  C) 1.51 x 10${}^{22}$
  D) 3.02 x 10${}^{22}$
  Show Answer
  The correct answer is C .
• Question 898: A solid that absorbs water from he atmosphere and forms an aqueous solution is? Options:
  A) hydrophilic
  B) efforescent
  C) deliquescent
  D) hygroscopic
  Show Answer
  The correct answer is C .
• Question 899: Which of the followingstatements is TRUE? Options:
  A) The dissolution of NaOH_(s) in water is endothermic
  B) The heat os solution of NaOH_(s) is positive
  C) The NaOH_(s) gains heat from the surroundings
  D) The heat of solution of NaOH_(s) is negative
  Show Answer
  The correct answer is D .
• Question 900: The salt formed from strong acid and a strong base is Options:
  A) complex
  B) neutral
  C) basic
  D) acidic
  Show Answer
  The correct answer is B .