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MCQs

Total Questions : 425 | Page 8 of 43 pages
Question 71. Sodium (Na) is not
  1.    insoluble in water
  2.    a salt
  3.    explosive in air
  4.    stable in air
 Discuss Question
Answer: Option D. -> stable in air
Answer: (d).stable in air
Question 72. Only covalent molecule conducting electricity is
  1.    helium
  2.    selenium
  3.    mercury
  4.    graphite
 Discuss Question
Answer: Option D. -> graphite
Answer: (d).graphite
Question 73. Ionic compounds are
  1.    soluble in water
  2.    good conductors of electricity if in molten state
  3.    bad conductors of electricity
  4.    both a and b
 Discuss Question
Answer: Option D. -> both a and b
Answer: (d).both a and b
Question 74. Tetrahedral three dimensional lattices are a result of
  1.    ionic bonds
  2.    covalent bonds
  3.    metallic bonds
  4.    distillate
 Discuss Question
Answer: Option B. -> covalent bonds
Answer: (b).covalent bonds
Question 75. Ionic bond is important in
  1.    metals of Group-I
  2.    non-metals in Group-VI
  3.    metalloids of Group-III
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Answer: (d).all of these
Question 76. The bond angles in methane (CH₄) are
  1.    180°
  2.    87.5°
  3.    120°
  4.    109.5°
 Discuss Question
Answer: Option D. -> 109.5°
Answer: (d).109.5°
Question 77. The amount of energy required to break a specific covalent bond is called
  1.    bond dissociation energy
  2.    bond energy
  3.    bond enthalpy
  4.    all of above
 Discuss Question
Answer: Option D. -> all of above
Answer: (d).all of above
Question 78. The identical bonds in molecules which possesses two type of bonds have bond energies totally
  1.    different
  2.    unique
  3.    same
  4.    constant
 Discuss Question
Answer: Option A. -> different
Answer: (a).different
Question 79. Exothermic enthalpy changes are shown as
  1.    negative values
  2.    positive values
  3.    neutral
  4.    constant
 Discuss Question
Answer: Option A. -> negative values
Answer: (a).negative values
Question 80. To initiate a reaction, the minimum energy which is required to break bonds is called
  1.    bond energy
  2.    activation energy
  3.    breaking energy
  4.    ionization energy
 Discuss Question
Answer: Option B. -> activation energy
Answer: (b).activation energy

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