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 1031:

  

  The oxidation of the compound above produces

  Options:
  A) 2-butanone
  B) 2-butanal
  C) 3-butanal
  D) 3-butanone
  Show Answer
  The correct answer is A .
• Question 1032: X_(g) + 3Y_(g) ---- 2z_(g) H = +ve. if the reaction above takes place at room temperature, the G will be Options:
  A) negative
  B) zero
  C) positive
  D) indeterminate
  Show Answer
  The correct answer is D .
• Question 1033:

  C₂H₅OH_(aq) → Y

  If the above reaction takes place in conc. H₂SO₄ at 180^o, Y represents

  Options:
  A) CH₄
  B) C₂H₅COOH
  C) C₂H₄
  D) CH₃OCH₃
  Show Answer
  The correct answer is C .
• Question 1034: In countries where the temperature fall below 273k, salt always spilled on the ray road in order to Options:
  A) increase the making point office
  B) increase the density of the ice
  C) make the ice impure
  D) rinse the making point of the ice
  Show Answer
  The correct answer is A .
• Question 1035: The fraction of crude oil used as jet fuel is? Options:
  A) refinery gas
  B) diesel oil
  C) kerosene
  D) gasoline
  Show Answer
  The correct answer is C .
• Question 1036: Brass and bronze are both metallic alloys. Which of the following constituents is common to both alloys? Options:
  A) Tin
  B) Zinc
  C) Copper
  D) Lead
  E) Aluminium
  Show Answer
  The correct answer is C .
• Question 1037: Duralumin consists of aluminium, copper, ? Options:
  A) zinc and gold
  B) lead and maganese
  C) nickle and silver
  D) manganese and magnesium
  Show Answer
  The correct answer is D .
• Question 1038: A property of a colloidal dispersion which a solution does not have is? Options:
  A) the Tyndall effect
  B) homogeneity
  C) osmotic pressure
  D) surface polarity
  Show Answer
  The correct answer is A .
• Question 1039:

  

  The graph above demonstrate the effect of

  Options:
  A) surface area on the rate of reaction
  B) catalyst on the rate of reaction
  C) pressure on the rate reaction
  D) concentration on the rate of reaction
  Show Answer
  The correct answer is A .
• Question 1040: Which of the following is an electrolyte? Options:
  A) Alcohol
  B) Sodium acetate solution
  C) Solid potassium hydroxide
  D) Mercury
  Show Answer
  The correct answer is B .