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 1761:

  Which of the following metals cannot replace hydrogen from water or steam?

  Options:
  A) Sodium
  B) Magnesium
  C) Iron
  D) Calcium
  Show Answer
  The correct answer is D .
• Question 1762: A solution containing chloride ions gives white precipitate with silver trioxonitrate(V) Solution. The precipitate will be insoluble in dilute? Options:
  A) HNO ₃ but soluble in ammonia solution
  B) HNO₃ and ammonia solution
  C) HCl but soluble in ammonia solution
  D) HCl and in ammonia solution
  Show Answer
  The correct answer is A .
• Question 1763: The pair of metals in the reactivity series that are usually extracted by the electrolysis of their ores is Options:
  A) magnesium and zinc
  B) magnesium and calcium
  C) copper and zinc
  D) lead and calcium
  Show Answer
  The correct answer is B .
• Question 1764:

  Which of the following types of bonding does not involve the formation of new substances?

  Options:
  A) Metallic
  B) Covalent
  C) Co-ordinate
  D) Electrovalent
  Show Answer
  The correct answer is A .
• Question 1765: The ratio of the number of molecules in 2g of hydrogen to that in 16g of oxygen is Options:
  A) 2:1
  B) 1:1
  C) 1:2
  D) 1:4
  E) 1:8
  Show Answer
  The correct answer is A .
• Question 1766: The constituent common to duralumin and alnico is Options:
  A) Co
  B) Mn
  C) Al
  D) Mg
  Show Answer
  The correct answer is C .
• Question 1767: In what way is equilibrium constant for the forward reaction related to that of the reversed reaction? Options:
  A) The additional of the two is expected to be one
  B) The product of the two is expected to be one
  C) The two equilibrium constants are identical
  D) The product of the two is always greater than one
  Show Answer
  The correct answer is A .
• Question 1768: In general, an increase in temperature increases the solubility of a solute in water because? Options:
  A) more solute molecules collide with each other
  B) most solutes dissolve with the evoltion of heat
  C) more solute molecules dissociate at hihger temperatures
  D) most solutes dissolve with absorption of heat
  Show Answer
  The correct answer is C .
• Question 1769:

  2-methylprop-1-ene is a structuralisomer of?

  Options:
  A) But-1-yne
  B) 2-methyl But-1-ene
  C) 3-methyl prop-1-yne
  D) But-2-ene
  Show Answer
  The correct answer is D .
• Question 1770: Which of the following will shift to the left from dilute tetraoxosulphate (VI) acid? Options:
  A) Lead
  B) Magnesium
  C) Cpper
  D) Gold
  Show Answer
  The correct answer is B .