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MCQs

Total Questions : 194 | Page 9 of 20 pages
Question 81. Burning of methane (CH₄) gives off heat and
  1.    carbon dioxide (gas)
  2.    water (gas)
  3.    hydrogen gas
  4.    both a and b
 Discuss Question
Answer: Option D. -> both a and b
Answer: (d).both a and b
Question 82. Endothermic reactions take place when
  1.    energy given out in making bonds is less than the energy taken in for breaking bonds
  2.    energy given out in making bonds is more than the energy taken in for breaking bonds
  3.    energy given out in making bonds is equal to the energy taken in for breaking bonds
  4.    none of these
 Discuss Question
Answer: Option A. -> energy given out in making bonds is less than the energy taken in for breaking bonds
Answer: (a).energy given out in making bonds is less than the energy taken in for breaking bonds
Question 83. Energy changes in a chemical reaction can be represented through
  1.    energy profile diagram
  2.    energy prolific graph
  3.    Sensors
  4.    data loggers
 Discuss Question
Answer: Option A. -> energy profile diagram
Answer: (a).energy profile diagram
Question 84. Water with lesser oxygen is known to
  1.    cause water pollution
  2.    disturb the balance of life in river
  3.    be poisonous
  4.    both a and b
 Discuss Question
Answer: Option D. -> both a and b
Answer: (d).both a and b
Question 85. Burning of glucose produces heat and
  1.    carbon dioxide (gas)
  2.    water (gas)
  3.    oxygen (gas)
  4.    both a and b
 Discuss Question
Answer: Option D. -> both a and b
Answer: (d).both a and b
Question 86. When carbon reacts with oxygen to form CO₂, the enthalpy of formation is
  1.    692 KJ/mol
  2.    393.5 KJ/mol
  3.    393.7 KJ/mol
  4.    285.8 KJ/mol
 Discuss Question
Answer: Option C. -> 393.7 KJ/mol
Answer: (c).393.7 KJ/mol
Question 87. Amount of heat absorbed when one mole solid sublimes are called
  1.    Molar heat of Fusion
  2.    Molar heat of vaporization
  3.    Molar heat of reaction
  4.    Molar heat of sublimation
 Discuss Question
Answer: Option D. -> Molar heat of sublimation
Answer: (d).Molar heat of sublimation
Question 88. Amount of heat absorbed in changing one mole of liquid into vapours is
  1.    Molar heat of Fusion
  2.    Molar heat of vaporization
  3.    Molar heat of reaction
  4.    Molar heat of formation
 Discuss Question
Answer: Option B. -> Molar heat of vaporization
Answer: (b).Molar heat of vaporization
Question 89. The specific heat of water is
  1.    2.2 J/Kg
  2.    3.2 J/Kg
  3.    4.2 J/Kg
  4.    5.2 J/Kg
 Discuss Question
Answer: Option C. -> 4.2 J/Kg
Answer: (c).4.2 J/Kg
Question 90. Standard enthalpy of reaction for the formation of water is
  1.    285.8 KJ/mol
  2.    (-) 285.8 KJ/mol
  3.    692 KJ/mol
  4.    (-)692 KJ/mol
 Discuss Question
Answer: Option B. -> (-) 285.8 KJ/mol
Answer: (b).(-) 285.8 KJ/mol

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