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 1441:

  What is the sum of the oxidation numbers in a neutral compound?

  Options:
  A) +2
  B) -1
  C) 0
  D) +1
  Show Answer
  The correct answer is C .
• Question 1442: The molecular lattice of iodine is held together by Options:
  A) dative bond
  B) metallic bond
  C) hydrogen bond
  D) van der Waal's forces
  Show Answer
  The correct answer is D .
• Question 1443:

  

  What is the IUPAC name for the compound?

  Options:
  A) 1-chloro-2-methylprop-2,3-ene
  B) 1-chloro-2-methylprop-2-ene
  C) 3-chloro-2-methylprop-1-ene
  D) 3-chloro-2methylprop-1,2-ene
  Show Answer
  The correct answer is C .
• Question 1444:

  The hydrogen ion concentration of a sample of orange juice is $2.0\times {10}^{-11}$ moldm${}^{-3}$. What is its p${}^{\text{OH}}$? $\log {10}^2=0.3010$

  Options:
  A) 3.30
  B) 13.00
  C) 10.70
  D) 11.30
  Show Answer
  The correct answer is A .
• Question 1445:

  If 10.5g of lead (II) trioxonitrate (V) is dissolved in 20cm³ of distilled water at 18^oC, the solubility of the solute in mol dm^-3 is

  [Pb = 207, N = 14, O = 16]

  Options:
  A) 1.60
  B) 5.25
  C) 16.00
  D) 525.00
  Show Answer
  The correct answer is A .
• Question 1446: The compound that is used as an anaesthetic is Options:
  A) CCl₄
  B) CH Cl₃
  C) CH₂Cl₂
  D) CH₃Cl
  Show Answer
  The correct answer is B .
• Question 1447: If the ONLY pollutants found in the atmosphere over a city are oxides of nitrogen, suspended lead compounds. carbon monoxide and high levels of methane, the probable source(s) of the pollution must be? Options:
  A) automobile exhaust and biological decomposition
  B) combustion of coal and automobile exhaust
  C) biological decomposition only
  D) combustion of coal, automobile exhaust and biological decomposition
  E) combustion of coal and biological decomposition
  Show Answer
  The correct answer is B .
• Question 1448: Gunpower is made from charcoal, sulphur and potassium trioxonitrate (V) The salt in the mixture performs the function of Options:
  A) an oxidant
  B) a reductant
  C) a solvent
  D) a catalyst
  Show Answer
  The correct answer is A .
• Question 1449: The raw materials used for the smelting of iron ore in a furnace is Options:
  A) CaSO₄
  B) CaCO₃
  C) CuSO₄
  D) Zn(NO₃)₂
  Show Answer
  The correct answer is B .
• Question 1450: On exposure to the atmosphere, a hydrated salt loses its water of crystallization to become anhydrous. This phenomenon is referred to as Options:
  A) efflorescence
  B) diliquescence
  C) hygroscopy
  D) hydrolysis
  Show Answer
  The correct answer is A .