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 971:

  A chemical reaction in which the hydration energy is greater than the lattice energy is referred to as

  Options:
  A) A reversible reaction
  B) A spontenous reaction
  C) An endothermic reaction
  D) An exothermic reaction
  Show Answer
  The correct answer is D .
• Question 972: Iron can be protected from corrosion by coating the surface with Options:
  A) gold
  B) silver
  C) copper
  D) zinc
  Show Answer
  The correct answer is D .
• Question 973: Liquid X, reacts with sodium trioxocarbonate (IV) (Na₂CO₃) to give a gas which turns calcium chloride solution milky X is Options:
  A) Na₂SO₄(aq)
  B) Kl (aq)
  C) an alkali
  D) an acid
  E) a hydrocarbon
  Show Answer
  The correct answer is D .
• Question 974: What is the percentage of sulphur in sulphur (IV) oxide? Options:
  A) 66%
  B) 25%
  C) 40%
  D) 50%
  Show Answer
  The correct answer is D .
• Question 975: An organic compound contains 72% carbon, 12% hydrogen and 16% oxygen by mass. The empirical formula of the compound is Options:
  A) C₈H₂₂O₃
  B) C₆H₁₀O₃
  C) C₁₂H₁₂O
  D) C₆H₁₂O
  E) C₃H₆O
  Show Answer
  The correct answer is D .
• Question 976:

  What is the atomic number of aluminium?

  Options:
  A) 13
  B) 26
  C) 14
  D) 12
  Show Answer
  The correct answer is A .
• Question 977: The colour of methyl orange in alkaline medium is Options:
  A) yellow
  B) pink
  C) orange
  D) red
  Show Answer
  The correct answer is A .
• Question 978:

  Which important nitrogen-containing compound is produced in Haber's process?

  Options:
  A) NH${}_3$
  B) NO${}_2$
  C) NO
  D) HNO${}_3$
  Show Answer
  The correct answer is A .
• Question 979: A common characteristic between zinc and the other transition elements is the ability to Options:
  A) have variable oxidation states
  B) from complex ions
  C) act as a catalyst
  D) from coloured ions
  Show Answer
  The correct answer is B .
• Question 980: Beryllium and aluminium have similar properties because they Options:
  A) are both metals
  B) belong to the same group
  C) belong to the same period
  D) are positioned diagonally to each other
  Show Answer
  The correct answer is D .