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 1011: Tetraoxosulphate (IV) ions are finally tested using? Options:
  A) acidified silver nitrate
  B) acidified barium chloride
  C) ime-water
  D) dilute hydrochloric acid
  E) acidified lead nitrate
  Show Answer
  The correct answer is B .
• Question 1012:

  

  Use the diagram above to answer this question. The activation energy of the uncatalysed reaction is

  Options:
  A) X
  B) X + Y
  C) X - Y
  D) Y
  Show Answer
  The correct answer is A .
• Question 1013: How many isomers does pentane have? Options:
  A) 6
  B) 5
  C) 4
  D) 3
  Show Answer
  The correct answer is D .
• Question 1014: The reaction of an alkene with hydrogen in the presence of catalyst is Options:
  A) a substitution reaction
  B) an oxidation reaction
  C) a nucleophilic reaction
  D) an addition reaction
  Show Answer
  The correct answer is D .
• Question 1015: The major and most effective way of controlling pollution is to Options:
  A) improve machinery so that the substances released from combustion are less harmful
  B) pass strict laws against it by individuals and companies
  C) educate people on the causes and effects of pollution
  D) convert chemical wastes to harmless substances before releasing them into the environment
  Show Answer
  The correct answer is C .
• Question 1016: 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 1017: The product formed at the the cathode during the electrolysis of sodium chloride solution with carbon electrodes is? Options:
  A) sodium
  B) chlorine
  C) hydrogen
  D) sodium hydroxide
  E) oxygen
  Show Answer
  The correct answer is C .
• Question 1018: One advantages of detergents over soap is that detergents? Options:
  A) are easier to maufacture
  B) foam more than soap
  C) form soluble salts with hard water
  D) are able to deter germs more than soap
  Show Answer
  The correct answer is C .
• Question 1019: The commonest feature of reactions at the anode is that Options:
  A) electrons are consumed
  B) oxidation is involved
  C) ions are reduced
  D) electrode dissolves
  Show Answer
  The correct answer is B .
• Question 1020:

  A sample of any of the following substances disappearsafter some time when exposed to air like camphor, naphthalene, or dry ice. This phenomenon is called?

  Options:
  A) Sublimation
  B) Evaporation
  C) Diffusion
  D) Radiation
  Show Answer
  The correct answer is A .