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 911: When the two end alkyl groups ethyl ethanoate are interchange, the compound formed is known as Options:
  A) methyl ethanoate
  B) ethyl propanaote
  C) methyl propanoate
  D) propyl ethanoate
  Show Answer
  The correct answer is C .
• Question 912:

  CH₃-CH-CH₃

  CH₂CI Is known as?

  Options:
  A) 1-chloro-2-methylbutane
  B) 1-chloro-2-methylpropane
  C) 2-chloromethylpropane
  D) 1-chloro-2, 2-dimethylethane
  Show Answer
  The correct answer is B .
• Question 913: Which of the gases is employed as an anaesthesia? Options:
  A) N ₂O
  B) NO₂
  C) NH₃
  D) NO
  Show Answer
  The correct answer is A .
• Question 914: How many Faraday of electricity are required to deposit 0.20 mole of nickel, if 0.10 Faraday of electricity deposited 2.98g of nickel during electrolysis of its aqueous solution?(Ni = 58.7, 1F = 96 500 C mol^-) Options:
  A) 0.20
  B) 0.30
  C) 0.40
  D) 0.50
  Show Answer
  The correct answer is C .
• Question 915:

  The process or act of extracting a metal from its ore and refining it is called?

  Options:
  A) Extraction
  B) Metal mining
  C) Mettallurgy
  D) Prospecting
  Show Answer
  The correct answer is C .
• Question 916: How many lone pairs of electron are there on the central atom of the H₂O molecules? Options:
  A) 1
  B) 2
  C) 3
  D) 4
  Show Answer
  The correct answer is B .
• Question 917: What is the volume of oxygen required to bum completely 45cm${}^3$ of methane at s.t.p? Options:
  A) 135.0cm${}^3$
  B) 180.0cm${}^3$
  C) 45.0cm${}^3$
  D) 190.0cm${}^3$
  E) 90.0cm${}^3$
  Show Answer
  The correct answer is E .
• Question 918:

  

  The functional group represented in the compound above is

  Options:
  A) alkanol
  B) alanal
  C) alkanone
  D) alanoate
  Show Answer
  The correct answer is C .
• Question 919:

  

  The IUPAC nomenclature for the compound above is

  Options:
  A) dimethlhexane
  B) 3,5 dimethylhexane
  C) 1.1 dmethyl, 3 methylpentane
  D) 2.4 dimethylhexane
  Show Answer
  The correct answer is D .
• Question 920: A gas sample with an initial volume of 3.25 dm³ is heated and allowed to expand to 9.75 dm³ at constant pressure. What is the ratio of the final absolute temperature to the initial absolute temperature? Options:
  A) 3:1
  B) 5:2
  C) 5:4
  D) 8:3
  Show Answer
  The correct answer is A .