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 291: Which of the following classes of organic compounds undergoes rapid oxidation with bromine water? Options:
  A) alcohols
  B) alkenes
  C) carboxylic acids
  D) esters
  E) alkanes
  Show Answer
  The correct answer is B .
• Question 292: Which of the following processes leads to increase in entropy? Options:
  A) Mixing a sample of NaCl and sand
  B) Condensation of water vapour
  C) Boiling a sample of water
  D) Cooling a saturated solution
  Show Answer
  The correct answer is C .
• Question 293: which of these metals CANNOT replace hydrogen from alkaline solutions? Options:
  A) Aluminium
  B) Zinc
  C) Tin
  D) Iron
  Show Answer
  The correct answer is A .
• Question 294:

  The sub-atomic particles located in the nucleus of an atomare?

  Options:
  A) neutron and proton
  B) proton and electron
  C) proton and ions
  D) neutron and electron
  Show Answer
  The correct answer is A .
• Question 295:

  0.16g of methane when burnt raises the temperature of 100g of water by 40°C. What is the of combustion of methane when if the heat capacity of water is 4.2 Jg^-1°C^-1?

  (CH₄ = 16)

  Options:
  A) 1,160 kJ mol^-1
  B) 1,180 kJ mol^-1
  C) 1,560 kJ mol^-1
  D) 1,600kJ mol^-1
  E) 1,680 kJ mol^-1
  Show Answer
  The correct answer is E .
• Question 296:

  

  Which of the curves in the above graph illustrates the behaviour of an ideal gas?

  Options:
  A) W
  B) X
  C) Y
  D) Z
  Show Answer
  The correct answer is C .
• Question 297: If an element has the electronic configuration 1s ² 2s² 2p³ 3s² 3p⁴, it is Options:
  A) a metal
  B) an alkaline earth metal
  C) an s-block element
  D) a p-Block element
  E) a transition element
  Show Answer
  The correct answer is D .
• Question 298:

  

  Choose the correct option from the graph above.

  3Fe_(S) + 4H₂O_(g) ⇌ Fe₃O_4(s) + 4H_2(g). The equilibrium constant, K, of the reaction above is represented as

  Options:
  A) A
  B) B
  C) C
  D) D
  Show Answer
  The correct answer is C .
• Question 299:

  Which of the following alkaline metals react more quickly spontaneously with water?

  Options:
  A) Calcium
  B) Beryllium
  C) Magnesium
  D) Strontium
  Show Answer
  The correct answer is A .
• Question 300: In the laboratory preparation of oxygen, dried oxygen is usually collected over Options:
  A) hydrochloric acid
  B) mercury
  C) calcium chloride
  D) tetraoxosulphate (VI) acid
  Show Answer
  The correct answer is B .