Class X

We store silver chloride in a dark coloured bottle because it is
  1. a white solid
  2. undergoes redoc reaction
  3. to avoid action by sunlight
  4. None of these
An element X on exposure to moist air turns reddish-brown and a new compound Y is formed. The substance X and Y are
  1. X = Fe, Y = Fe2O3
  2. X = Ag, Y = Ag2S
  3. X = Cu, Y = CuO
  4. X = Al, Y = Al2O3
When carbon dioxide is passed through lime water
  1. calcium hydroxide is formed
  2. white precipitate of CaO is formed
  3. lime water turns milky
  4. colour of lime water disappears
The reaction in which two compound exchange their ions to form two new compounds is called
  1. displacement reaction
  2. combination reaction
  3. double displacement reaction
  4. redox reaction
When a magnesium ribbon is burnt in air, the ash formed is
  1. black
  2. white
  3. yellow
  4. pink
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