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MCQs

Total Questions : 368 | Page 2 of 37 pages
Question 11. If Cp of water is (23 + T) J/°C, what is the enthalpy change of water from 3°C to 5°C?
  1.    54 J
  2.    96 J
  3.    140 J
  4.    196 J
 Discuss Question
Answer: Option A. -> 54 J
Answer: (a).54 J
Question 12. Cp of ice is 10 J/°C and that of water is 15 J/°C, what is the enthalpy change of water from – 15°C to 0°C at standard conditions, if the later heat of fusion of water is 110 J?
  1.    150 J
  2.    315 J
  3.    485 J
  4.    560 J
 Discuss Question
Answer: Option C. -> 485 J
Answer: (c).485 J
Question 13. Cp of water is 10 J/°C and that of steam is 15 J/°C, what is the enthalpy change of water from 75°C to 110°C at standard conditions, if the later heat of vaporization of water is 245 J?
  1.    395 J
  2.    645 J
  3.    840 J
  4.    999 J
 Discuss Question
Answer: Option B. -> 645 J
Answer: (b).645 J
Question 14. Cp of ice is 25 J/°C and that of water is 30 J/°C, what is the enthalpy change of water from – 10°C to 35°C at standard conditions, if the later heat of fusion of water is 110 J?
  1.    250 J
  2.    595 J
  3.    960 J
  4.    1410 J
 Discuss Question
Answer: Option D. -> 1410 J
Answer: (d).1410 J
Question 15. If Cp of water is 45T J/°C, what is the enthalpy change of water from 6°C to 8°C?
  1.    7 J
  2.    14 J
  3.    28 J
  4.    56 J
 Discuss Question
Answer: Option B. -> 14 J
Answer: (b).14 J
Question 16. A mixture contains 20% O₂ with CP = 10 J/°C, 30% N₂ with CP = 20 J/°C and 50% CO₂ with CP= 40 J/°C, what is the average CP of mixture?
  1.    20 J/°C
  2.    28 J/°C
  3.    34 J/°C
  4.    42 J/°C
 Discuss Question
Answer: Option B. -> 28 J/°C
Answer: (b).28 J/°C
Question 17. A mixture contains 20% O₂ with CP = 15 J/°C and 80% CO₂ with CP = 20 J/°C, what is the average CP of mixture?
  1.    3 J/°C
  2.    9 J/°C
  3.    16 J/°C
  4.    19 J/°C
 Discuss Question
Answer: Option D. -> 19 J/°C
Answer: (d).19 J/°C
Question 18. What is the value of CP – CV for ideal gases?
  1.    0
  2.    R/2
  3.    R
  4.    2R
 Discuss Question
Answer: Option C. -> R
Answer: (c).R
Question 19. A mixture contains 30% Ar with CP = 30 J/°C, 30% N₂ with CP = 20 J/°C and 40% CH₄ with CP = 10 J/°C, what is the average CP of mixture?
  1.    7 J/°C
  2.    12 J/°C
  3.    19 J/°C
  4.    26 J/°C
 Discuss Question
Answer: Option C. -> 19 J/°C
Answer: (c).19 J/°C
Question 20. A mixture contains 20% SO₂ with CP= 35 J/°C, 30% NO₃ with CP = 20 J/°C and 50% CO₂ with CP = 40 J/°C, what is the average CP of mixture?
  1.    12 J/°C
  2.    17 J/°C
  3.    25 J/°C
  4.    33 J/°C
 Discuss Question
Answer: Option D. -> 33 J/°C
Answer: (d).33 J/°C

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