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Total Questions : 194 | Page 3 of 20 pages
Question 21. The lower boiling point of 2,2 dimethyl propane can be attributed to
  1.    number of electrons
  2.    lining up of molecules
  3.    compact molecular structure
  4.    more contact points
 Discuss Question
Answer: Option C. -> compact molecular structure
Answer: (c).compact molecular structure
Question 22. One of the given compounds with the same number of electrons have a lower boiling point, that compound is
  1.    2,2 dimethyl propane
  2.    pentane
  3.    hexane
  4.    butene
 Discuss Question
Answer: Option A. -> 2,2 dimethyl propane
Answer: (a).2,2 dimethyl propane
Question 23. The technique which we use to measure enthalpy change of reactions is known as
  1.    spectrometry
  2.    calorimetry
  3.    stoichiometry
  4.    geoalgometry
 Discuss Question
Answer: Option B. -> calorimetry
Answer: (b).calorimetry
Question 24. Boiling point becomes higher due to increase in the
  1.    Van der Waals' forces only
  2.    number of electrons only
  3.    number of protons
  4.    Van der Waals' forces and number of electrons
 Discuss Question
Answer: Option D. -> Van der Waals' forces and number of electrons
Answer: (d).Van der Waals' forces and number of electrons
Question 25. Number of contact points are more in
  1.    2,2 dimethyl propane
  2.    pentane
  3.    ethane
  4.    methane
 Discuss Question
Answer: Option B. -> pentane
Answer: (b).pentane
Question 26. Which statement is incorrect?
  1.    boiling point is independent of the number of contact points
  2.    boiling point depends upon the number of electrons
  3.    boiling point depends upon the number of protons
  4.    boiling point is dependent on number of neutrons
 Discuss Question
Answer: Option A. -> boiling point is independent of the number of contact points
Answer: (a).boiling point is independent of the number of contact points
Question 27. In Van der Waal's forces, forces of attraction are formed between
  1.    σ+ of dipole of one atom/molecule and σ− of dipole of next atom/molecule
  2.    π+ of dipole of one atom/molecule and π− of dipole of next atom/molecule
  3.    δ+ of dipole of one atom/molecule and δ− of dipole of next atom/molecule
  4.    none of above
 Discuss Question
Answer: Option C. -> δ+ of dipole of one atom/molecule and δ− of dipole of next atom/molecule
Answer: (c).δ+ of dipole of one atom/molecule and δ− of dipole of next atom/molecule
Question 28. Noble gases can be liquefied at
  1.    low temperatures
  2.    high temperatures
  3.    low pressures
  4.    high bond energies
 Discuss Question
Answer: Option A. -> low temperatures
Answer: (a).low temperatures
Question 29. An increase in the number of electrons increases the
  1.    Van der Waal's forces
  2.    enthalpy change of vaporization
  3.    boiling points of noble gases
  4.    melting point of Nobel gases
 Discuss Question
Answer: Option B. -> enthalpy change of vaporization
Answer: (b).enthalpy change of vaporization
Question 30. In order to increase the Van der Waal's forces,
  1.    contact points shall be minimized
  2.    contact points shall be made extinct
  3.    number of electrons shall be increased
  4.    number of protons shall be reduced
 Discuss Question
Answer: Option C. -> number of electrons shall be increased
Answer: (c).number of electrons shall be increased

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