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 1361: Elements X and Y have electronic configurations 1s²2s²2p⁶ and 1s²2s²2p⁶3s²3p¹ respectively. When they combine, the formula of the compound formed is Options:
  A) XY
  B) YX
  C) X₂Y₃
  D) Y₂X₃
  Show Answer
  The correct answer is D .
• Question 1362:

  

  Which of the following is the correct order in the above diagram increasing boiling point, of the isomeric C₅H₁₂ compounds?

  Options:
  A) A
  B) B
  C) C
  D) D
  E) E
  Show Answer
  The correct answer is A .
• Question 1363:

  What is the concentration of a solution containing 2g of NaOH in 100cm3 of solution? [Na = 23, O =16, H = 1]

  Options:
  A) 0.40 moldm${}^{-3}$
  B) 0.50 moldm${}^{-3}$
  C) 0.05 moldm${}^{-3}$
  D) 0.30 moldm${}^{-3}$
  Show Answer
  The correct answer is B .
• Question 1364: Which of the following compounds is a base? Options:
  A) CO₂
  B) CaO
  C) H₃PO₃
  D) CH₃COOCH₃
  Show Answer
  The correct answer is B .
• Question 1365: A metallic ion X²⁺ with an inert gas structure contains 18 electrons. How many protons are there in this ion? Options:
  A) 20
  B) 18
  C) 16
  D) 2
  Show Answer
  The correct answer is A .
• Question 1366: Which of the following hydrocarbons is mainly used as fuel? Options:
  A) Methylene
  B) Ethylene
  C) Methane
  D) Ethyne
  Show Answer
  The correct answer is C .
• Question 1367: Which of the following statements is correct about the average kinetic energy of the molecules of a gas? Options:
  A) It increase with increase in pressure
  B) It increase at constant temperature
  C) It increase with increase in temperature
  D) It increase with increase in volume
  Show Answer
  The correct answer is C .
• Question 1368:

  What is Faraday's constant?

  Options:
  A) 6.022 x 10${}^{23}$ mol${}^{-1}$
  B) 3.00 x 10${}^8$ m/s
  C) 9.81 m/s${}^2$
  D) 96,485 C/mol
  Show Answer
  The correct answer is D .
• Question 1369: According to the kinetic theory, an increase in temperature causes the kinetic energy of particles to Options:
  A) Decrease
  B) Increase
  C) Remain constant
  D) Be zero
  Show Answer
  The correct answer is B .
• Question 1370:

  Which of the following pairs of substances will react further with oxygen to form a higher oxide?

  Options:
  A) CO${}_2$ and H${}_2$O
  B) NO and H${}_2$O
  C) CO and CO${}_2$
  D) SO${}_2$ and NO
  Show Answer
  The correct answer is D .