Class XI

In Na2CO3.10H2O, after water, highest percentage composition is of
  1. Sodium
  2. Oxygen
  3. Carbon
  4. Hydrogen
Consider reactants: HNO3 and BaSO3
  1. Reaction takes place in aquatic state
  2. Reaction results in Barium nitrate
  3. Reaction results in barium nitrite
  4. Reaction may not occur at all
 Copper ion can be written as
  1. Co+1
  2. Co+2
  3. Cu+1
  4. Cu+2
 In diamond, arrangement of carbon is
  1. Hexagonal
  2. Tetrahedral
  3. Octagonal
  4. Cube shaped
Amphoteric oxides include
  1. K2O
  2. CO2
  3. SO2
  4. Al2O3
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