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 2031:

  ME + nF -----> pG + qH 

  In the equation shown, the equilibrium constant is given by?

  Options:
  A) $\frac{[E{]}^m[F]}{[G{]}^p[H{]}^q}$
  B) $\frac{[E][F]}{[G][H]}$
  C) $\frac{[G{]}^p[H{]}^p}{[E{]}^m[F{]}^n}$
  D) $\frac{[G][H]}{[E][F]}$
  Show Answer
  The correct answer is C .
• Question 2032: What is the volume of oxygen required to burn complete 45 cm³ of methane at s.t.p? Options:
  A) 135.0 cm³
  B) 180.0 cm³
  C) 45.0 cm³
  D) 90.0 cm³
  Show Answer
  The correct answer is D .
• Question 2033:

  Which of the following can be obtained by fractional distillation? 

  Options:
  A) Nitrogen from liquid air
  B) Sodium Chloride from sea water
  C) Iodine from solution of Iodine in carbon tetrachloride
  D) Sulphur from the solution of sulphur in carbon disulphide
  Show Answer
  The correct answer is A .
• Question 2034: If 48,000 coulombs of electricity are required to discharge 0.5 mole of sodium from a molten sodium chloride mass, then the number of coulombs required to discharge 2 moles of lead from molten lead (ll) chloride is? Options:
  A) 48,000
  B) 96,000
  C) 192,000
  D) 384,000
  E) 576,000
  Show Answer
  The correct answer is D .
• Question 2035:

  

  Use the above option to answer this question. The dehydration of ammonium salt of alkanoic acids produces a compound with the general formula

  Options:
  A) A
  B) B
  C) C
  D) D
  Show Answer
  The correct answer is B .
• Question 2036: In the industrial production of H₂ from natural gas the CO₂ produced along with the H₂ is removed by Options:
  A) washing under pressure
  B) drying over phosphorus (V) oxide
  C) passing the mixture into lime water
  D) using ammonical copper (I) chloride
  Show Answer
  The correct answer is A .
• Question 2037: The acid used in electrolysis of water is dilute Options:
  A) HNO₃
  B) CH₃COOH
  C) H₂SO₄
  D) HCl
  Show Answer
  The correct answer is C .
• Question 2038:

  

  Choose the correct option from the structure above

  Options:
  A) A
  B) B
  C) C
  D) D
  Show Answer
  The correct answer is C .
• Question 2039:

  C_(s) + 2S_(g) → CS_2(g)

  ΔH = +89 kJ mol^-1

  The chemical equation above implies that

  Options:
  A) each of carbon and sulphur has 89 kJ of energy
  B) both carbon and sulphur contribute 89 kJ of energy
  C) 89 kJ of energy is released
  D) 89 kJ of energy is absorbed
  Show Answer
  The correct answer is D .
• Question 2040: Which of the following statements is correct during the electrolysis of a caustic soda solution using platinum electrodes? Options:
  A) Oxygen gas is given off at the cathode
  B) Hydrogen gas is given of at the anode
  C) Sodium metals is deposited at the anode
  D) Sodium metal is deposited at the cathode
  E) AAlkalinity at the cathode increases
  Show Answer
  The correct answer is E .