Lakshya Education MCQs

Question: 10% oleum comprises of 10% free
Answer: Option C

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Question 1. The catalyst used in the production of elemental sulphur from H₂S (by oxidation-reduction) is
  1.    Alumina
  2.    Silica gel
  3.    Platinum
  4.    Nickel
Answer: Option A
Question 2. In contact process, SO₃ is absorbed in 97% H₂SO₄ and not in water, because
  1.    SO₃ gas is sparingly soluble in water
  2.    Water forms an acid mist, which is difficult to absorb
  3.    The purity of acid is affected
  4.    Scale formation in the absorber is to be avoided
Answer: Option B
Question 3. 99.5% purity oxygen is used in
  1.    Cutting and welding by oxy-acetylene flame
  2.    Hospitals for medicinal purposes
  3.    Gas masks and artificial breathing apparatus
  4.    All of the above
Answer: Option D
Question 4. 20% oleum means that in 100 kg oleum, there are 20 kg of
  1.    SO₃ and 80kg of H₂SO₄
  2.    H₂SO₄ and 80kg of SO₃
  3.    SO₃ for each 100 kg of H₂SO₄
  4.    None of these
Answer: Option A
Question 5. __________ is an ore of lead.
  1.    Quartz
  2.    Galena
  3.    Siderite
  4.    Chalcopyrite
Answer: Option B
Question 6. __________ is a polysacchride.
  1.    Maltose
  2.    Starch
  3.    Sucrose
  4.    Glucose
Answer: Option B

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