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MCQs

Total Questions : 95 | Page 9 of 10 pages
Question 81. The ground state energies of H atom and H2 molecule are “13.6 eV and “31.7 eV, respectively. The
dissociation energy of H2 is _______ eV.
  1.    4.4 to 4.6
  2.    3.7 to 3.9
  3.    2.4 to 2.6
  4.    5.1 to 5.3
 Discuss Question
Answer: Option A. -> 4.4 to 4.6


-NA-


Question 82. A 2 L vessel containing 2 g of H2 gas at 27 °C is connected to a 2 L vessel containing 176 g of CO2
gas at 27 °C. Assuming ideal behavior of H2 and CO2, the partial pressure of H2 at equilibrium is
________ bar.
  1.    2 to 2.5
  2.    4 to 4.5
  3.    6 to 6.5
  4.    8 to 8.5
 Discuss Question
Answer: Option C. -> 6 to 6.5


-NA-


Question 83. At 273 K and 10 bar,the Langmuir adsorption of a gas on a solid surface gave the fraction of surface coverage as 0.01. The Langmuir adsorption isotherm constant is _________ bar“1. (Give the answer to the third decimal place)
  1.    0.0009 to 0.0011
  2.    0.0011 to 0.0013
  3.    0.0013 to 0.0015
  4.    0.0015 to 0.0017
 Discuss Question
Answer: Option A. -> 0.0009 to 0.0011


-NA-


Question 84. For the first order consecutive reaction P → Q → R, under steady state approximation to [Q], the variations of [P], [Q] and [R] with time are best represented by
  1.    .
  2.    .
  3.    .
  4.    .
 Discuss Question
Answer: Option C. -> .


-NA-


Question 85. Conversion of boron trifluoride to tetrafluoroborate accompanies
  1.    increase in symmetry and bond elongation
  2.    increase in symmetry and bond contraction
  3.    decrease in symmetry and bond contraction
  4.    decrease in symmetry and bond elongation
 Discuss Question
Answer: Option A. -> increase in symmetry and bond elongation


-NA-


Question 86. The correct statement with respect to the bonding of the ligands, Me3N and Me3P with the metal
ions Be2+ and Pd2+ is,
  1.    the ligands bind equally strong with both the metal ions as they are dicationic
  2.    the ligands bind equally strong with both the metal ions as both the ligands are pyramidal
  3.    the binding is stronger for Me3N with Be2+ and Me3P with Pd2+
  4.    the binding is stronger for Me3N with Pd2+ and Me3P with Be2+
 Discuss Question
Answer: Option C. -> the binding is stronger for Me3N with Be2+ and Me3P with Pd2+


-NA-


Question 87. The number of oxygen molecule(s) that a molecule of hemerythrin can transport is _______.
  1.    1
  2.    2
  3.    3
  4.    4
 Discuss Question
Answer: Option A. -> 1


-NA-


Question 88. Among the compounds given in the options A-D, the one that can be used as a formyl anion
equivalent (in the presence of a strong base) is
  1.    ethylene
  2.    nitroethane
  3.    1,3-dithiane
  4.    1,4-dithiane
 Discuss Question
Answer: Option C. -> 1,3-dithiane


-NA-


Question 89. The infrared spectrum of HCl gas shows an absorption band centered at 2885 cm“1. The zero point
energy of HCl molecule under harmonic oscillator approximation is
  1.    2.8665 * 10"“22 J
  2.    2.8665 * 10"“20 J
  3.    5.7330 * 10"“22 J
  4.    5.7330 * 10"“20 J
 Discuss Question
Answer: Option B. -> 2.8665 * 10"“20 J


-NA-


Question 90. For the reaction X2O4 (l) → 2XO2 (g) at 298 K, given the values, ΔU = 9 kJ and ΔS = 84 J K“1, ΔG is
  1.    "“11.08 kJ
  2.    +11.08 kJ
  3.    "“13.55 kJ
  4.    +13.55 kJ
 Discuss Question
Answer: Option B. -> +11.08 kJ


-NA-


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