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MCQs

Total Questions : 194 | Page 2 of 20 pages
Question 11. A secondary cell used in a car battery is composed of plates of
  1.    lead only
  2.    lead oxide only
  3.    lead sulfate
  4.    lead and lead oxide
 Discuss Question
Answer: Option D. -> lead and lead oxide
Answer: (d).lead and lead oxide
Question 12. The symbol for enthalpy is
  1.    E
  2.    H
  3.    P
  4.    Y
 Discuss Question
Answer: Option B. -> H
Answer: (b).H
Question 13. The change in the energy between a chemical reaction and the surroundings at constant temperature is called
  1.    enthalpy change
  2.    enthalpy
  3.    enthalpy profile
  4.    dynamic enthalpy
 Discuss Question
Answer: Option A. -> enthalpy change
Answer: (a).enthalpy change
Question 14. Kilojoules per mole are the unit of
  1.    bond energy
  2.    enthalpy change
  3.    density
  4.    volume
 Discuss Question
Answer: Option B. -> enthalpy change
Answer: (b).enthalpy change
Question 15. In the enthalpy profile diagram, the reactants and products are represented on
  1.    z-axis
  2.    x-axis
  3.    y-axis
  4.    none of above
 Discuss Question
Answer: Option C. -> y-axis
Answer: (c).y-axis
Question 16. In an equation, the positive sign (+ΔH) indicates that the reaction is
  1.    endothermic
  2.    exothermic
  3.    ectothermic
  4.    hypothermic
 Discuss Question
Answer: Option A. -> endothermic
Answer: (a).endothermic
Question 17. Anhydrous calcium chloride (CaCl₂) and water (H₂O) react together to heat the food by
  1.    endothermic
  2.    exothermic
  3.    ectothermic
  4.    hypothermic
 Discuss Question
Answer: Option B. -> exothermic
Answer: (b).exothermic
Question 18. The endothermic chemical reaction absorbs energy from
  1.    surrounding
  2.    inside
  3.    reactants
  4.    products
 Discuss Question
Answer: Option A. -> surrounding
Answer: (a).surrounding
Question 19. Lithium Fluoride's lattice energy to Magnesium oxide is
  1.    lesser
  2.    greater
  3.    same
  4.    never known
 Discuss Question
Answer: Option A. -> lesser
Answer: (a).lesser
Question 20. The chemical reactions which emit energy to surroundings are called
  1.    endothermic
  2.    exothermic
  3.    ectothermic
  4.    hypothermic
 Discuss Question
Answer: Option B. -> exothermic
Answer: (b).exothermic

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