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 1181:

  

  Use the above options to the question. The products formed on hydrolysis of

  Options:
  A) A
  B) B
  C) C
  D) D
  E) E
  Show Answer
  The correct answer is C .
• Question 1182:

  A radioactive nucleus has a half-life of 20 years, starting with 100,000 particles, how many particles will be left exactly at the end of 40 years

  Options:
  A) 75,000 particles
  B) 35,000 particles
  C) 25,000 particles
  D) 50,000 particles
  Show Answer
  The correct answer is C .
• Question 1183: Reduction of alkanonoes with LialH₄ produces Options:
  A) primary alkanols
  B) secondary alkanols
  C) tertiary alkanols
  D) polyhydric alkanols
  Show Answer
  The correct answer is B .
• Question 1184:

  1.1 g of CaCI₂ dissolved in 50 cm³ of water caused a rise in temperature of3.4°C. The heat of reaction, ∆H for CaCI₂ in kj per mole is?

  (Ca = 40, CI = 35.5, specific heat of water is 4.18 jk^-1

  Options:
  A) -71.1
  B) -4.18
  C) +71.1
  D) +111.0
  Show Answer
  The correct answer is A .
• Question 1185: Water molecules can be liquids especially when they are bonded to Options:
  A) alkaline earth metals
  B) alkali metals
  C) transition metals
  D) group VII elements
  Show Answer
  The correct answer is C .
• Question 1186: A change in temperature of a saturated solution disturb the equilibrium between the Options:
  A) Dissolved solute and the solvent
  B) Solvent and undissolved solute
  C) Dissolved solute and undissolved solute
  D) Dissolved solute and the solution
  Show Answer
  The correct answer is C .
• Question 1187: The group IA metals are not found free in nature because they Options:
  A) are very reactive and unstable
  B) are malleable and ductile
  C) have high melting and boiling point
  D) conduct heat and electricity
  Show Answer
  The correct answer is A .
• Question 1188:

  The maximum electron in N shell is?

  Options:
  A) 2
  B) 8
  C) 18
  D) 32
  Show Answer
  The correct answer is D .
• Question 1189: The solubility product of Cu(IO₃)₂ is 1.08 * 10^-7. Assuming that neither ions react appreciable with water to form H⁺ and OH^-, what is the solubility of this salt? Options:
  A) 2.7 * 10^-8 mol dm^-3
  B) 9.0 * 10^-8 mol dm^-3
  C) 3.0 * 10^-3 mol dm^-3
  D) 9.0 * 10^-3 mol dm^-3
  Show Answer
  The correct answer is D .
• Question 1190: Which of the following substances is the most abundant in the universe? Options:
  A) Carbon
  B) Air
  C) Water
  D) Oxygen
  E) Hydrogen
  Show Answer
  The correct answer is E .