Class XI

Which of the following shows the masses of the three elementary particles in decreasing order?
  1. Leptons, Baryons, Mesons
  2. Mesons, Baryons, Leptons
  3. Baryons, Mesons, Leptons
  4. Leptons, Mesons Baryons
Water is a good solvent of ionic salts because
  1. it has a high specific heat
  2. it has no colour
  3. it has a high dipole moment
  4. it has a high boiling point
LPG consists of mainly
  1. methane, ethane and hexane
  2. . ethane, hexane and nonane
  3. methane, hexane and nonane
  4. methane, butane and propane
Which of the following is not an isotope of hydrogen?
  1. Tritium
  2. Deuterium
  3. Protium
  4. Yttrium
. Potassium Permanganate is used for purifying drinking water, because
  1. it is a sterilising agent
  2. it dissolves the impurities of water
  3. it is a reducing agent
  4. it is an oxidising agent
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