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 361:

  The oxidation state(s) of nitrogen in ammonium nitrite is/are

  Options:
  A) -3, +3
  B) +5
  C) -3, +5
  D) -3
  Show Answer
  The correct answer is A .
• Question 362: Which of the following gases can be collected by the upward displacement of air? Options:
  A) NO
  B) H ₂
  C) NH₃
  D) Cl ₂
  Show Answer
  The correct answer is D .
• Question 363: A polymerization reaction is one in which? Options:
  A) small molecules form giant molecules
  B) atoms form molecules
  C) giant molecules form small molecules
  D) molecules form volatile compounds
  E) a molecule rearranges itself
  Show Answer
  The correct answer is A .
• Question 364:

  Which of the following statements is true regarding the melting and boiling points of pure substances?

  Options:
  A) The boiling point is always higher than the melting point
  B) The melting point is always higher than the boiling point
  C) The melting and boiling points are always the same for all substances
  D) The melting and boiling points can vary depending on the substance
  Show Answer
  The correct answer is D .
• Question 365: The final products of the reaction between methane and chlorine in the presence of ultraviolet light are hydrogen chloride and Options:
  A) tricloromethane
  B) dichloromethane
  C) tetrachloromethane
  D) chloromethane
  Show Answer
  The correct answer is C .
• Question 366:

  0.1 faraday of electricity deposited 2.95 g of nickel during electrolysis of an aqueous solution.

  Calculate the number of moles of nickel that will be deposited by 0.4 faraday? (Ni = 58.7)

  Options:
  A) 0.20
  B) 0.30
  C) 0.04
  D) 5.87
  Show Answer
  The correct answer is A .
• Question 367: If chlorine gas is bubbled into water and then this yellowish-green coloured solution is exposed to bright sunlight for a while Options:
  A) the solution will give out chlorine gas and hydrogen chloried gas
  B) the solution will produce chlorine gas and oxygen
  C) the solution will give out solution will producing hypochloric acid
  D) the solution is decomposed giving out oxygen, hydrogen and chlorine
  E) the solution will give out oxygen gas leaving behind aqueous hydrochloric acid
  Show Answer
  The correct answer is E .
• Question 368:

  

  Use the above option to answer this question. The dehydration of ammonium salt of alkanoic acids produces a compound with the general formula

  Options:
  A) A
  B) B
  C) C
  D) D
  Show Answer
  The correct answer is B .
• Question 369: The alkaline hydrolysis of fats and oils produces soap and Options:
  A) propane 1, 1, 3 - triol
  B) propane - 1,2,3 - triol
  C) propane - 1,3,3 - triol
  D) propane - 1, 2, 2 - triol
  Show Answer
  The correct answer is B .
• Question 370:

  The compounds made up of only carbon and hydrogen are called?

  Options:
  A) Carbon compounds
  B) Hydrocarbons
  C) Atoms
  D) Carbon hydrolysis
  Show Answer
  The correct answer is B .