Lakshya Education MCQs

Question: Styrene (a monomer for the production of polystyrene) is commercially produced by
A.Catalytic dehydrogenation of ethyl benzene
B.Dehydration of ethyl alcohol followed by hydrogenation
C.Reacting ethylene oxide with acetal-dehyde
D.Fermentation of starch
Answer: Option A

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Question 1. Mercury cells for caustic soda manufacture, compared to diaphragm cells
  1.    Require lower initial investment
  2.    Require more power
  3.    Produce lower concentration NaOH
  4.    None of these
Answer: Option D
Question 2. Trinitrotoluene (TNT), an explosive, is made by the nitration of
  1.    Nitrobenzene
  2.    Toluene
  3.    Nitrotoluene
  4.    Benzene
Answer: Option B
Question 3. __________ of rubber decreases after its vulcanisation.
  1.    Resistance to the action of organic solvent
  2.    Tackiness
  3.    Maximum service temperature
  4.    Tensile strength
Answer: Option B
Question 4. Magnesium and calcium __________ cause temporary hardness of water.
  1.    Carbonates
  2.    Bicarbonates
  3.    Phosphates
  4.    Sulphates
Answer: Option B
Question 5. In the Solvay process, the product from the calciner is
  1.    Light soda ash
  2.    Dense soda ash
  3.    Sodium bicarbonate
  4.    Dehydrated soda ash
Answer: Option A
Question 6. Prussian blue is chemically represented by
  1.    FeO.TiO₂
  2.    Ca SO₄ . 2H₂O
  3.    Fe₄ [Fe (CN₆)₃]
  4.    AlF₃ . 3NaF
Answer: Option C

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