Class XI

Refractory materials are examples of
  1. Ionic bonds
  2. Covalent bonds
  3. Metallic bonds
  4. Dative bond
 If valency of both Calcium and Sulphate ion is 2, formula of calcium sulphate will be
  1. CaSO3
  2. CaSO4
  3. Ca2(SO4)2
  4. Ca2SO4
 Consider equation P2O5 + H2O → HPO3. moles of products produced after balancing equation are
  1. 1
  2. 2
  3. 3
  4. 4
 All of these radicals have a valency of 1, except
  1. OH
  2. CO3
  3. NO3
  4. HCO3
Oxidation involves
  1. Gain in oxygen
  2. Loss of oxygen
  3. Gain in hydrogen
  4. Gain in electrons
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