Class XI

Amalgams are
  1. highly coloured alloys
  2. alloys which contain mercury as one of the contents
  3. alloys which have great resistance to abrasion
  4. . alloys which contain carbon
Bell metal is an alloy of
  1. nickel and copper
  2. zinc and copper
  3. brass and nickel
  4. tin and copper
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 among the following is a positively charged particle emitted by a radioactive element?
  1. Beta ray
  2. Alpha ray
  3. Cathode ray
  4. Gamma ray
. 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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