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 331: An example of an alcohol is Options:
  A) CCl₄
  B) CH₃COOH
  C) CHCl₃
  D) C₂H₆
  E) CH₃OH
  Show Answer
  The correct answer is E .
• Question 332:

  What mass of Cu would be produced by the cathodic reduction of Cu${}^{2+}$  when 1.60A of current passes through a solution of CuSO${}_4$ for 1 hour. (F=96500Cmol${}^{-1}$ , Cu=64)

  Options:
  A) 7.64g
  B) 3.82g
  C) 1.91g
  D) 0.96g
  Show Answer
  The correct answer is C .
• Question 333: How many grams of bromine will be required to completely react with 10 g of propyne?(C = 12, H = 1, Br = 80) Options:
  A) 20 g
  B) 40 g
  C) 60 g
  D) 80 g
  Show Answer
  The correct answer is D .
• Question 334: Which of the following statements is true? Options:
  A) an increase in the temperature of a given mass of gas increases the number of gas molecules
  B) an increase in the temperature of the gas does not affect the kinetic energy
  C) an increase in the pressure of the gas is proportional to the increase in volume
  D) a decrease in the pressure of a gas is proportional to the decrease in volume at constant temperature
  E) a decrease in the pressure of the gas decreases the number of gas molecules present
  Show Answer
  The correct answer is D .
• Question 335: The salt formed from a weak acid and a strong base hydrolyzes in water to form Options:
  A) A saturated solution
  B) an acidic solution
  C) a buffer solution
  D) an alkaline solution
  Show Answer
  The correct answer is D .
• Question 336: The arrangement of particles in crystal lattices can be studied using Options:
  A) X - rays
  B) γ - rays
  C) α - rays
  D) β - rays
  Show Answer
  The correct answer is A .
• Question 337: In which of the following are water molecules in the most disorderly arrangement? Options:
  A) Ice at -10°C
  B) Ice at 0°C
  C) Water at 100°C
  D) Steam at 100°C
  Show Answer
  The correct answer is D .
• Question 338:

  The volume occupied by 1.58g of a gas at S.T.P is 500cm${}^3$. What is the relative molecular mass of the gas?  [ G.M.V at S.T.P = 22.4dm${}^3$ ]

  Options:
  A) 28
  B) 32
  C) 44
  D) 71
  Show Answer
  The correct answer is D .
• Question 339:

  

  The option above shows the PH changes for the titration of a

  Options:
  A) strong acid versus strong base
  B) weak acid versus strong base
  C) strong acid versus weak base
  D) weak acid versus weak base
  Show Answer
  The correct answer is A .
• Question 340: The sulphide which is insoluble in dilute hydrochloric acid is Options:
  A) FeS
  B) CuS
  C) ZnS
  D) Na₂S
  Show Answer
  The correct answer is B .