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 651: Group 1 A metals are not found free in nature because they? Options:
  A) are of low melting and boiling points
  B) have weak metallic bonding
  C) conduct electricity and heat
  D) are very reactive
  Show Answer
  The correct answer is D .
• Question 652: The hybridization of the carbon atom in ethyne is Options:
  A) sp ⁴
  B) sp ³
  C) sp²
  D) sp
  E) s
  Show Answer
  The correct answer is D .
• Question 653: Sodium hydroxide (NaOH) pellets are Options:
  A) deliquescent
  B) hygroscopic
  C) efflorescent
  D) hydrated
  E) fluorescent
  Show Answer
  The correct answer is A .
• Question 654:

  

  Use the figure above to answer this question. Which of the following is NOT a monomer?

  Options:
  A) A
  B) B
  C) C
  D) D
  Show Answer
  The correct answer is A .
• Question 655:
  

  Use the section of the periodic table above to answer this question.

  Which of the indicate an alkali metal and a noble gas respectively?

  Options:
  A) M and E
  B) G and E
  C) R and L
  D) G and L
  Show Answer
  The correct answer is D .
• Question 656: Which of the following metals will liberate hydrogen from steam or dilute acid? Options:
  A) Copper
  B) Iron
  C) Lead
  D) Mercury
  Show Answer
  The correct answer is B .
• Question 657: When sulphur (IV) oxide is passed into a solution of sodium hydroxide for a long time, it eventually produces a solution of Options:
  A) NaHSO₄
  B) Na₂SO₃
  C) NaHSO₃
  D) Na₂SO₄
  Show Answer
  The correct answer is B .
• Question 658:

  CH₃ - CH₂ - C CH

  The hybridization in the compound above is

  Options:
  A) Sp²
  B) sp
  C) sp³ and sp²
  D) sp³ and sp
  Show Answer
  The correct answer is D .
• Question 659: For a given solute, the concentration of its saturated solution in different solvents are Options:
  A) the same at the same temperature
  B) different at the same temperature
  C) the same at different temperature
  D) constant
  Show Answer
  The correct answer is B .
• Question 660:

  What volume of oxygen is produced from the decomposition of 2 mole of KCIO₃ at s.t.p?

  [Molar volume of a gas at s.t.p = 22.4 dm³]

  Options:
  A) 22.4 dm³
  B) 33.6 dm³
  C) 44.8 dm³
  D) 67.2 dm³
  Show Answer
  The correct answer is D .