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 571: In the reaction 1O^-₃ + 5l^- + 6H⁺ → 31₂ + 3H₂O, the oxidizing agent is? Options:
  A) H⁺
  B) l^-
  C) 1O^-
  D) l₂
  Show Answer
  The correct answer is C .
• Question 572: Addition of aqueous ammonia to a solution of Zn⁺⁺ gives a white precipitate which dissolves in an excess of ammonia because? Options:
  A) zinc is amphoteric
  B) zinc hydroxide is readily soluble
  C) zinc forms a complex which is readily soluble in excess ammonia
  D) ammonia solution is a strong base
  Show Answer
  The correct answer is C .
• Question 573: mE + nF → pG + qH. In the equation above, the equilibrium constant is given by? Options:
  A) (E)^m(F)ⁿ/ (G)ⁿ(H)^q
  B) (E)(F) / (G)(H)
  C) (G)^p(H)^q / (E)^m(F)ⁿ
  D) (G)(H) / (E)(F)
  Show Answer
  The correct answer is C .
• Question 574: Which of the following pairs of substance will react further with oxygen to form a higher oxide? Options:
  A) CO₂ and H₂O
  B) NO and H₂O
  C) CO and CO₂
  D) SO₂ and NO
  Show Answer
  The correct answer is D .
• Question 575: The molecular formula of a common organic laboratory anaesthetic is Options:
  A) CHCl₃
  B) CHI₃
  C) CCl₄
  D) CHF₃
  Show Answer
  The correct answer is A .
• Question 576: Insoluble salts can be prepared by Options:
  A) titrating an alkali against an appropriate acid
  B) reacting an acid with trioxocarbonatr (IV) salt
  C) directing combination of the elements which make up the salt
  D) mixing two soluble compounds containing the metallic radical and the acidic radical
  Show Answer
  The correct answer is D .
• Question 577: Sulphur (IV) oxide bleaches by Options:
  A) Reduction
  B) Oxidation
  C) Hydration
  D) Adsorption
  Show Answer
  The correct answer is A .
• Question 578: The number of electrons in the valence shell of an element of atomic number 14 is? Options:
  A) 1
  B) 2
  C) 3
  D) 4
  Show Answer
  The correct answer is D .
• Question 579:

  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 580:

  Who proposed the planetary model of the atom with electrons orbiting the nucleus?

  Options:
  A) Erwin Schrödinger
  B) Ernest Rutherford
  C) Niels Bohr
  D) J.J. Thomson
  Show Answer
  The correct answer is C .