Class X

The electrolytic decomposition of water gives H2 and O2 in the ratio of
  1. 1 : 2 by volume
  2. 2 : 1 by volume
  3. 8 : 1 by mass
  4. 1 : 2 by mass
When a magnesium ribbon is burnt in air, the ash formed is
  1. black
  2. white
  3. yellow
  4. pink
The reaction of H2 gas with oxygen gas to form water is an example of
  1. combination reaction
  2. redox reaction
  3. exothermic reaction
  4. all of the above
In the decomposition of lead (II) nitrate to give lead (II) oxide, nitrogen dioxide and oxygen gas, the coefficient of nitrogen dioxide (in the balanced equation) is
  1. 1
  2. 2
  3. 3
  4. 4
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
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