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CHEMISTRY MCQs

Total Questions : 2589 | Page 11 of 259 pages
Question 101. Browning of paper in old books is caused by
  1.    Frequent use
  2.    Lack of aeration
  3.    Collection of dust
  4.    Oxidation of cellulose
 Discuss Question
Answer: Option D. -> Oxidation of cellulose
Question 102. What is the element that is in the highest percentage in the composition of the earth ?
  1.    Silicon
  2.    Oxygen
  3.    Magnesium
  4.    Iron
 Discuss Question
Answer: Option B. -> Oxygen
Question 103. Which among the following is used to dilute oxygen in the gas cylinders used by divers ?
  1.    Krypton
  2.    Argon
  3.    Helium
  4.    Neon
 Discuss Question
Answer: Option C. -> Helium
Question 104. Which one element from below list is liquid at room temperature?
  1.    Zinc
  2.    Argon
  3.    Lead
  4.    Bromine
 Discuss Question
Answer: Option D. -> Bromine
Question 105. Which among the following elements is found in maximum percentage in the human body ?
  1.    Carbon
  2.    Hydrogen
  3.    Nitrozen
  4.    Oxygen
 Discuss Question
Answer: Option D. -> Oxygen
Question 106. Iodine can be separated from a mixture of Iodine and Potassium Chloride by
  1.    Sedimentation
  2.    Filtration
  3.    Sublimation
  4.    Distillation
 Discuss Question
Answer: Option C. -> Sublimation
Question 107. The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing is:
  1.    Neon
  2.    Argon
  3.    Krypton
  4.    Helium
 Discuss Question
Answer: Option D. -> Helium
Question 108. Which one among the following is not a mixture?
  1.    Graphite
  2.    Glass
  3.    Brass
  4.    Steel
 Discuss Question
Answer: Option A. -> Graphite
Question 109. The gas used to dilute oxygen for breathing by deep sea divers is:
  1.    Neon
  2.    Argon
  3.    Nitrogen
  4.    Helium
 Discuss Question
Answer: Option D. -> Helium
Question 110. Select the one which is not a mixture :
  1.    Air
  2.    Gasoline
  3.    LPG
  4.    Distilled water
 Discuss Question
Answer: Option D. -> Distilled water

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