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MCQs

Total Questions : 740 | Page 8 of 74 pages
Question 71. The metal used for the manufacturing of fibre-glass is
  1.    Gold
  2.    Platinum
  3.    Silver
  4.    Mercury
 Discuss Question
Answer: Option B. -> Platinum
Answer: (b).Platinum
Question 72. The name halogen is derived from Greek word which means
  1.    Acid forming
  2.    Base forming
  3.    Salt forming
  4.    None of above
 Discuss Question
Answer: Option C. -> Salt forming
Answer: (c).Salt forming
Question 73. Calcium burns in air giving a mixture of
  1.    Oxides and sulphides
  2.    Sulphides and hydroxides
  3.    Oxides and nitrides
  4.    None of above
 Discuss Question
Answer: Option C. -> Oxides and nitrides
Answer: (c).Oxides and nitrides
Question 74. The melting point of tungsten is
  1.    155 °C
  2.    3100 °C
  3.    3310 °C
  4.    3410 °C
 Discuss Question
Answer: Option D. -> 3410 °C
Answer: (d).3410 °C
Question 75. KCl.MgCl₂.6H₂O is the chemical formula of
  1.    Borax
  2.    Natron
  3.    Carnalite
  4.    Alunite
 Discuss Question
Answer: Option C. -> Carnalite
Answer: (c).Carnalite
Question 76. Formation of Grignard's reagent involves following equation C₂H₅I + Mg →
  1.    C₂H₂Mg
  2.    C₂H₅MgI
  3.    MgI₂
  4.    C₂H₂
 Discuss Question
Answer: Option B. -> C₂H₅MgI
Answer: (b).C₂H₅MgI
Question 77. The ionization energy of group I and II decreases and their reactivities
  1.    Increases
  2.    Decreases
  3.    Remain constant
  4.    Never change
 Discuss Question
Answer: Option A. -> Increases
Answer: (a).Increases
Question 78. Which one of the following is used to kill bacteria in drinking water and swimming pools?
  1.    Fluorine
  2.    Chlorine
  3.    Bromine
  4.    Iodine
 Discuss Question
Answer: Option B. -> Chlorine
Answer: (b).Chlorine
Question 79. Magnesium has great affinity for
  1.    Oxygen
  2.    Hydrogen
  3.    Nitrogen
  4.    None of above
 Discuss Question
Answer: Option A. -> Oxygen
Answer: (a).Oxygen
Question 80. The melting point of Mercury is
  1.    15.5 °C
  2.    15.1 °C
  3.    (-)38.83 °C
  4.    67.6 °C
 Discuss Question
Answer: Option C. -> (-)38.83 °C
Answer: (c).(-)38.83 °C

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