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 2031:

  

  How many more isomers of the compound above can be obtained ?

  Options:
  A) 5
  B) 4
  C) 3
  D) 2
  Show Answer
  The correct answer is B .
• Question 2032: Which of the following methods may be used to prepare trioxonitrate (V) acid (nitric acid) in the laboratory? Options:
  A) Heating ammonia gas with tetraoxosulphate (VI) acid
  B) Heating ammonium trioxonitrate (V) with tetraoxosulphate (VI) acid
  C) Heating sodium trioxonitrate (V) with tetraoxosulphate (VI) acid
  D) Heating potassium trioxonitrate (V) with calcium hydroxide
  E) Heating a mixture of ammonia gas and oxygen.
  Show Answer
  The correct answer is C .
• Question 2033: The bond which joins two ethanoic acid molecules in the liquid state is Options:
  A) a covalent bond
  B) an ionic bond
  C) a dative covalent bond
  D) a hydrogen bond
  Show Answer
  The correct answer is D .
• Question 2034: Given the mean atomic mass of chlorine prepared in the laboratory to be 35.5 and assuming that chlorine contains two isotopes of mass number 35 nad 37, what is the percentage composition of the isotope of mass number 35? Options:
  A) 20
  B) 25
  C) 50
  D) 75
  E) 90
  Show Answer
  The correct answer is D .
• Question 2035: Palm wine turns sour with time because? Options:
  A) the sugar content is converted into alcohol
  B) the carbon (IV) oxide formed during the fermentation process has a sour taste
  C) it is commonly adulterated by the tappers and sellers
  D) microbial activity results in the production of orgain acids within it
  Show Answer
  The correct answer is D .
• Question 2036: Which of the following is acceptable as the organic product of the reaction of ethanoic acid and ethanol with an acid catalyst? Options:
  A) Ethyl ethanoate
  B) Methyl ethanoate
  C) Ethyl methyl ketone
  D) Butanol
  E) None
  Show Answer
  The correct answer is A .
• Question 2037: Calculate the amount in moles of a gas which occupies 10.5 dm³ at 6 atm and 30^oC [R = 082 atm dm³ K^-1 mol^-1] Options:
  A) 2.536
  B) 1.623
  C) 4.736
  D) 0.394
  Show Answer
  The correct answer is A .
• Question 2038: The distance between the nuclei of chlorine atoms in a chlorine molecule is 0.194nm. The atomic radius of chlorine atom is Options:
  A) 0.097nm
  B) 0.914nm
  C) 0.388nm
  D) 2.388nm
  Show Answer
  The correct answer is A .
• Question 2039: A chemical reaction is always associated with Options:
  A) an increase in the composition of one of the substance
  B) a change in the volume of the reactants
  C) a change in the nature of the reactants
  D) the formation of new substance
  Show Answer
  The correct answer is D .
• Question 2040: If 48,000 coulombs of electricity are required to discharge 0.5 mole of sodium from a molten sodium chloride mass, then the number of coulombs required to discharge 2 moles of lead from molten lead (ll) chloride is? Options:
  A) 48,000
  B) 96,000
  C) 192,000
  D) 384,000
  E) 576,000
  Show Answer
  The correct answer is D .