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 1041:

  

  The option above shows the PH changes for the titration of a

  Options:
  A) strong acid versus strong base
  B) weak acid versus strong base
  C) strong acid versus weak base
  D) weak acid versus weak base
  Show Answer
  The correct answer is A .
• Question 1042: Allotropes are elements having? Options:
  A) different physical but the same chemical properties
  B) different chemical but the same physical properties
  C) the same chemical and physical properties
  D) different atomic structure
  E) the same position in the periodic table
  Show Answer
  The correct answer is A .
• Question 1043: The solvent used for removing grease stain is Options:
  A) turpentine
  B) ammonia solution
  C) ethanol
  D) solution of borax in water
  Show Answer
  The correct answer is B .
• Question 1044:

  Which type of chemical combination involves the transfer of electrons from one atom to another, resulting in the formation of oppositely charged ions?

  Options:
  A) Ionic bonding
  B) Hydrogen bonding
  C) Covalent bonding
  D) Metallic bonding
  Show Answer
  The correct answer is A .
• Question 1045: The minimum volume of oxygen required for the complete combustion of a mixture of 10cm ³ of CO and 15 cm ³ of H ² is Options:
  A) 25.0cm³
  B) 12.5 cm³
  C) 10.0 cm³
  D) 5.0cm³
  Show Answer
  The correct answer is C .
• Question 1046: When hydrogen sulphide and sulphur dioxide are each passed in turn into a solution of potassium dichromate? Options:
  A) both gases change the colour of the solution from yellow to colourless
  B) both gases causes sulphur to be deposited
  C) only hydrogen sulphide decolourizes the solution
  D) only sulphur dioxide deposits sulphur
  E) only hydrogen sulphide deposits sulphur
  Show Answer
  The correct answer is E .
• Question 1047:

  

  In the experiment above, Z can be

  Options:
  A) a solution of sodium dioxonitrate (lll) and ammonium chloride
  B) a solution of lead trioxnitrate (V)
  C) a solution of sodium trioxonitrate (V) and ammonium chloride
  D) concentrated tetraoxosulphate (VI) acid and sodium trioxonitrate (V)
  Show Answer
  The correct answer is C .
• Question 1048: The salt that will form a precipitate soluble in excess ammonia solution is Options:
  A) Ca(NO₃)₂
  B) Cu(NO₃₎₂
  C) Mg(NO₃₎₂
  D) Al(NO₃₎₃
  Show Answer
  The correct answer is B .
• Question 1049: The importance of sodium aluminate (III) in the treatment of water is to Options:
  A) cause coagulation
  B) neutralize acidity
  C) prevent goitre and tooth decay
  D) kill germs
  Show Answer
  The correct answer is A .
• Question 1050: In the production of soap, concentrated sodium chloride solution is added to Options:
  A) increase the solubility of soap
  B) decrease the solubility of the soap
  C) saponify the soap
  D) emulsify the soap
  Show Answer
  The correct answer is B .