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 501:

  Which of the following statements does not show Rutherford's account of Nuclear Theory? An atom contains a region

  Options:
  A) which contains protons and neutrons
  B) which is positively charged
  C) which is massive and can cause deflection of a few projectiles
  D) which is very large and in which close to 98% of projectiles pass undeflected
  Show Answer
  The correct answer is C .
• Question 502:

  When anhydrous cobalt chloride paper is exposed to water, what color change is observed?

  Options:
  A) From pink to blue
  B) From white to blue
  C) From blue to white
  D) From blue to pink
  Show Answer
  The correct answer is D .
• Question 503: A particle that contains 8 proton, 9 neutrons and 7 electrons could be written as? Options:
  A) O
  B) O⁺
  C) O⁺
  D) O^-
  Show Answer
  The correct answer is B .
• Question 504: When ammonium, potassium and calcium carbonates are each separately heated Options:
  A) none of them will decompose
  B) each of them will decompose to give carbondioxide and the respective oxide
  C) ammonium carbonate and potassium carbonate will not decompose
  D) only ammonium carbonate and the respective oxide
  E) ammonium carbonate will decompose to give carbondioxide, water and ammonia
  Show Answer
  The correct answer is D .
• Question 505: The molecular lattice of iodine is held together by Options:
  A) dative bond
  B) metallic bond
  C) hydrogen bond
  D) van der Waal's forces
  Show Answer
  The correct answer is D .
• Question 506:

  In the preparation of salts, the method employed will depend on the?

  Options:
  A) composition
  B) dissociating ability
  C) stability to heat
  D) precipitating ability
  Show Answer
  The correct answer is C .
• Question 507: The major source of oxides of nitrogen is from the burning of Options:
  A) coal
  B) wood
  C) fuel
  D) chlrofluorocarbons
  Show Answer
  The correct answer is C .
• Question 508:

  What is the atomic number of aluminium?

  Options:
  A) 13
  B) 26
  C) 14
  D) 12
  Show Answer
  The correct answer is A .
• Question 509: The ability of carbon to form long chains is referred to as Options:
  A) Alkylation
  B) Acylation
  C) Carbonation
  D) Catenation
  Show Answer
  The correct answer is D .
• Question 510: A compound that gives a brick-red colour to a non-luminous flame is likely to contain Options:
  A) copper ions
  B) sodium ions
  C) calcium ions
  D) aluminium ions
  Show Answer
  The correct answer is C .