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 2181: The nucleus of an atom contains Options:
  A) protons only
  B) neurons only
  C) protons and electrons
  D) neutrons and electrons
  E) protons and neutrons
  Show Answer
  The correct answer is E .
• Question 2182: Stainless steel is an alloy of Options:
  A) carbon, iron and lead
  B) carbon, iron and chromium
  C) carbon, iron and copper
  D) carbon, iron and silver
  E) carbon and iron only
  Show Answer
  The correct answer is B .
• Question 2183:

  Which of the following is a unique property of water compared to other liquids?

  Options:
  A) It is a poor solvent
  B) It does not evaporate
  C) It expands when freezing
  D) It has a low heat capacity
  Show Answer
  The correct answer is C .
• Question 2184: The alkyl group is represented by the general formula Options:
  A) C_nH₂n
  B) C_nH₂n − 2
  C) C_nH₂n + 1
  D) C_nH₂n + 2
  Show Answer
  The correct answer is C .
• Question 2185: The weakest attractive force that can be observed between two molecules is Options:
  A) ionic
  B) covalent
  C) co-ordinate covalent
  D) vander Waals
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  The correct answer is D .
• Question 2186: The standard enthalpies of formation of CO_2(g), H₂O(g) and CO_(g) in kJ mol^- are -394, -242 and -110 respectively. What is the standard enthalpy change for the reaction CO_(g) + H_2(g)O → CO_2(g) + H_2(g)? Options:
  A) -42 KJ mol^-
  B) +42 KJ mol^-
  C) -262 KJ mol^-
  D) +262 KJ mol^-
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  The correct answer is A .
• Question 2187: The simplest branched-chain hydrocarbon is Options:
  A) ethane
  B) ethene
  C) propane
  D) butane
  Show Answer
  The correct answer is D .
• Question 2188: An element is electronegative if Options:
  A) it has a tendency to exist in the gaseous from
  B) its ions dissolve readily in water
  C) it has a tendency to lose electrons
  D) it has a tendency to gain electrons
  E) it readily froms covalent bonds
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  The correct answer is D .
• Question 2189: Carbon is tetravalent because Options:
  A) The electrons in both the 2s and 2p orbitals are equivalent
  B) The electrons in all the orbitals of carbon are equivalent
  C) The 2s and 2p atomic orbitals hybridize
  D) All the atomic orbitals of carbon hybridize
  Show Answer
  The correct answer is A .
• Question 2190: An element X has electron configuration 1s² 2s² 2p⁶ 3s² 3p⁵. Which of the following statements is correct about the element? Options:
  A) lt has a completely filled p-orbital
  B) lt has 5 electrons in its outermost shell.
  C) lt belongs to group ll on the periodic table
  D) lt is a halogen
  Show Answer
  The correct answer is D .