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 541: Three liquids X, Y and Z containing only hydrogen and carbon were burnt on a spoon. X and Y burnt with sooty flames while Z did not. Y is able to discharge the colour of bromine water whereas X and Z cannot. Which of the liquids would be aromatic in nature? Options:
  A) X and Z
  B) Y
  C) X
  D) Z
  Show Answer
  The correct answer is B .
• Question 542:

  In troposphere, the two types of pollutants are?

  Options:
  A) Gaseous and particulate pollutants
  B) Carbon and metallic pollutants
  C) Natural and man-made pollutants
  D) Sulphuric and nitrogenous pollutants
  Show Answer
  The correct answer is A .
• Question 543: Which of the following represent hybridization in ethyne? Options:
  A) Sp²
  B) Sp²d
  C) Sp³
  D) Sp
  Show Answer
  The correct answer is D .
• Question 544: One note of a hydrocarbon 36g of carbon and its density is 20. The structure of hydrocarbon is (organic chemical) Options:
  A) CH3C = CH
  B) CH3CH = CH2
  C) CH3CH2C = CH
  D) CH33CH2CH3
  Show Answer
  The correct answer is A .
• Question 545: Which of the following equimolar solutions will have the highest pH? Options:
  A) CH₃COOHa
  B) NaOH
  C) HCl
  D) NH₄OH
  Show Answer
  The correct answer is B .
• Question 546: The decarboxylation of ethanoic acid will produce carbon (IV)oxide and Options:
  A) methane
  B) ethane
  C) propane
  D) butane
  Show Answer
  The correct answer is A .
• Question 547:

  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 548:

  An organic compound with fishy smell is likely to have a general formula?

  Options:
  A) RCONHR${}^1$
  B) RCONH${}_2$
  C) RNH${}_2$
  D) RCOR${}^1$
  Show Answer
  The correct answer is C .
• Question 549:

  

  The compound above contains

  Options:
  A) Sp ³ hybridized carbon atoms only
  B) Sp ² hybridized carbon atoms only
  C) Sp ³ and Sp hybirdized carbon atoms
  D) Sp ³ and Sp ²
  Show Answer
  The correct answer is D .
• Question 550: A particle that contains 9 protons, 10 neutrons and 10 electrons is a Options:
  A) negative ion
  B) positive ion
  C) neutral atom of non-metal
  D) neutral atom of a metal
  Show Answer
  The correct answer is A .