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 1631:

  3CuO_(s) + 2NH_3(g) → 3Cu_(s) + 3H₂O_(I) N_2(g) (i).

  2NH_3(g) + 3Cl_2(g) → 6HCl_(g) + N_2(g) (ii).

  4NH_3(g) + 3O_2(g) → 6H₂O_(I) + 2N_2(g) (iii).

  The reactions represented by the equations above demonstrate the?

  Options:
  A) basic properties of ammonia
  B) acidic properties of ammonia
  C) reducing properties of ammonia
  D) oxidizing properties of ammonia
  Show Answer
  The correct answer is C .
• Question 1632:

  A cell shorthand notation can be written as A / A${}^{+}$ // B${}^{2+}$ /B. The double slash in the notation represents the 

  Options:
  A) electrolyte
  B) electrodes
  C) salt bridge
  D) solid - liquid interface
  Show Answer
  The correct answer is C .
• Question 1633: Safety matches contain sulphur and? Options:
  A) potassium trioxochlorate (V)
  B) potassium trioxonitrate (V)
  C) charcoal
  D) phosphorus sulphide
  Show Answer
  The correct answer is D .
• Question 1634:

  The reactivity of fluorine is due to?

  Options:
  A) its high electro negativity
  B) small size of fluorine atom
  C) availability of D-orbitals
  D) strong f-f bond
  Show Answer
  The correct answer is A .
• Question 1635: What volume of CO₂ at s.t.p would be obtained by reacting trioxocarbonate (IV) with excess acid?(G.M.V at s.t.p = 22.4 dm³) Options:
  A) 2.240 cm ³
  B) 22.40 cm ³
  C) 224.0 cm ³
  D) 2240 cm ³
  Show Answer
  The correct answer is B .
• Question 1636:

  

  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 1637: An element with atomic number twelve is likely to be Options:
  A) electrovalent with a velocity of 1
  B) electrovalent with a valency of 2
  C) covalent with a valency of 2
  D) covalent with valency of 4
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  The correct answer is B .
• Question 1638:

  A binary compound of oxygen with another element is referred to as?

  Options:
  A) Oxide
  B) Element
  C) Carbon
  D) Nitrogen
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  The correct answer is A .
• Question 1639: 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 1640: The process of converting linear alkanes to branched chain and cyclic hydrocarbons by heating in the presence of a catalyst to improve the quality of petrol is referred to as Options:
  A) refining
  B) craching
  C) reforming
  D) blending
  Show Answer
  The correct answer is C .