Class IX

Boron is a
  1. metal
  2. metalloid
  3. non-metal
  4. gas
Metals difficult to oxidize are called
  1. weak metals
  2. strong metals
  3. noble metals
  4. none of above
As we move across period basic character of oxides
  1. increases
  2. remains same
  3. decreases
  4. becomes zero
Metallic oxides are
  1. basic in nature
  2. acidic in nature
  3. slightly acidic in nature
  4. neutral
Oxide of aluminum is
  1. basic
  2. neutral
  3. amphoteric
  4. acidic
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