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 471:

  Which quantum divides shells into orbitals?

  Options:
  A) Spin
  B) Principal
  C) Azimuthal
  D) Magnetic
  Show Answer
  The correct answer is C .
• Question 472:

  

  From the above diagram, the caustic soda in the conical flask serves to

  Options:
  A) dry ethene gas
  B) remove carbon (iv) oxides from ethene
  C) remove carbon (ii) oxide from ethene
  D) remove sulphur (iv) oxide from ethene
  Show Answer
  The correct answer is C .
• Question 473:

  Which of the following is used to power steam engines?

  Options:
  A) lubricating oil
  B) coal
  C) bitumen
  D) diesel oil
  Show Answer
  The correct answer is B .
• Question 474: Which of the following pollutants is associated with brain damage? Options:
  A) Carbon (ll) oxide
  B) Radioactive fallout
  C) Biodegradable waste
  D) Sulphus (lV) oxide
  Show Answer
  The correct answer is A .
• Question 475: ${}_{88}^{226}Ra$ → ${}_{86}^{x}Rn$ + alpha particle Options:
  A) 226
  B) 220
  C) 227
  D) 222
  Show Answer
  The correct answer is D .
• Question 476: A major source of oxide of oxygen is from the burning of Options:
  A) coal
  B) wood
  C) fuel
  D) chlorofluorocarbons
  Show Answer
  The correct answer is A .
• Question 477:

  Which of the following compounds will form a solution if exposed to air?

  Options:
  A) Na₂CO₃.10H₂O
  B) NaNO₃
  C) CuSO₄
  D) CaCl₂
  E) NaSO₄.10H₂O
  Show Answer
  The correct answer is D .
• Question 478:

  The molar enthalpy change accompanying the removal of an electron from a gas phase atom orion in its ground state is called?

  Options:
  A) Electron gain enthalpy
  B) Ionization enthalpy
  C) Enthalpy change
  D) Enthalpic gas removal
  Show Answer
  The correct answer is B .
• Question 479: Fe₂O_3(s) + 2Al_(s) → Al₂O₃ + 2Fe_(s) If the heats of formation of Al₂O₃ and Fe₂O₃ are - 1670 kj mol^-1 and - 822 kj mol^-1 respectively, the enthalpy change in kj for the reaction is ? Options:
  A) +2492
  B) +848
  C) -848
  D) -2492
  Show Answer
  The correct answer is C .
• Question 480:

  Which of the following statements is true?

  Options:
  A) Metals conduct electricity while non-metals do not
  B) Metals have high density, non-metals have low density
  C) Metals form basic oxides, non-metals form acidic oxides
  D) In the electro chemical series, metals are above hydrogen while non-metals are below hydrogen
  E) Metals lose elections while non-metals gain electron during normal reactions
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  The correct answer is E .