Class XI

 Flour mills and coal mines need to be well ventilated because
  1. surface area of coal and flour needs to be digged out
  2. coal and flour particles are scattered in form of lumps
  3. coal and flour particles are scattered in form of powder
  4. coal and flour particles can get ignited very easily
Oxidation involves
  1. Gain in oxygen
  2. Loss of oxygen
  3. Gain in hydrogen
  4. Gain in electrons
 In 10H2O, total units of water molecules are
  1. 130
  2. 150
  3. 180
  4. 220
Refractory materials are examples of
  1. Ionic bonds
  2. Covalent bonds
  3. Metallic bonds
  4. Dative bond
Valency of Ferrum can be
  1. 2 or 4
  2. 4 or 6
  3. 3 or 5
  4. 2 or 3
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