Class X

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
Silver article turns black when kept in the open for a few days due to formation of
  1. H2S
  2. AgS
  3. AgSO4
  4. Ag2S
When a magnesium ribbon is burnt in air, the ash formed is
  1. black
  2. white
  3. yellow
  4. pink
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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