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Chapter No 8 : Thermochemistry (60 MCQ`S)

This chapter include mcqs on Thermochemistry, mcqs on Physical chemistry, Thermochemistry MCQs MDCAT, objective questions on thermochemistry for the preparation of public service commission exam, Classical Mechanics MCQs with answers pdf, Questions on Classical Mechanics, Classical Mechanics Questions and Answers with explanation for any competitive exam

  1. The heat of neutralization of a weak acid by a strong base as compared to that of a strong acid by a strong base is always:
    1. less
    2. greater
    3. equal
    4. none of these
      5. Show Answer
      Answer: A
      Explanation:
      • Weak acid or base reacts slowly.
  2. The equation; H2O(s) → H2O(l) ∆H = + 1.43 Kcal represents the process of:
    1. evaporation
    2. melting
    3. boiling
    4. fusion
      5. Show Answer
      Answer: D
      Explanation:
      • N/A
  3. Which one of the followings has gretaer heat of neutrlaization?
    1. HCN + NaOH → NaCN + H2O
    2. HCOOH + NH4OH → HCOONH4 + H2O
    3. HNO3 + KOH → KNO3 + H2O
    4. HCl + NH4OH → NH4Cl + H2O
      5. Show Answer
      Answer: C
      Explanation:
      • The heat of neutralization of a strong acid by a strong base is always greater than that of a weak acid/base by a strong base/acid.
  4. The heat of neutralization of a strong acid by a strong base is about:
    1. -11.9 Kcal
    2. -13.7 Kcal
    3. -12.3 Kcal
    4. -12.7 Kcal
      5. Show Answer
      Answer: B
      Explanation:
      • N/A
  5. Which substance has gretaer heat of vapourization per mole?
    1. H2O
    2. C2H5OH
    3. C6H6
    4. C2H6
      5. Show Answer
      Answer: A
      Explanation:
      • Water has strong H-bonding.
  6. The equation; I2(s) → I2(g) ∆H = + 14.92 Kcal represents the process of:
    1. evaporation
    2. sublimation
    3. boiling
    4. fusion
      5. Show Answer
      Answer: B
      Explanation:
      • N/A
  7. The change in enthalpy when one mole of an element changes from one allotropic form to another is called:
    1. heat of formation
    2. heat of atomization
    3. heat of allotropy
    4. heat of transition
      5. Show Answer
      Answer: D
      Explanation:
      • N/A
  8. Enthalpy of combustion of methane is "-890.3 KJ" while that of ethane is "-1559.7 KJ", which one has better fuel efficiency?
    1. methane
    2. ethane
    3. both have same
    4. cannot be predicted
      5. Show Answer
      Answer: A
      Explanation:
      • Methane produces more heat per gram.
  9. The enthalpy of solution is an endothermic process for:
    1. KCl
    2. MgSO4
    3. CuSO4
    4. NaOH
      5. Show Answer
      Answer: C
      Explanation:
      • N/A
  10. Heat of fusion is the enthalpy change when one mole of a solid substance is converted into liquid at its:
    1. freezing point
    2. melting point
    3. boiling point
    4. critical temperature
      5. Show Answer
      Answer: B
      Explanation:
      • N/A

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