Class XI

Mg + H2SO4 →
  1. MgSO4 + H2O
  2. MgSO4 + H2
  3. MgO + H2
  4. MgO + H2 + SO2
Non-metal oxides showing no reaction with acids or alkalis are called as
  1. Amphoteric acids
  2. Neutral oxides
  3. Acidic oxides
  4. Basic oxides
 When neutral, indicators show
  1. Red color
  2. Blue color
  3. Yellow/green color
  4. Pink color
Examples of non-conductors include
  1. Sulphur
  2. Phosphorus
  3. Wood
  4. All of these
 Elements with 4-7 valence electrons are referred to as
  1. metals
  2. non-metals
  3. inert gases
  4. transition metals
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