Class IX

Metals difficult to oxidize are called
  1. weak metals
  2. strong metals
  3. noble metals
  4. none of above
As we move across period from left to right, reactivity of metals with oxygen
  1. decreases
  2. increases
  3. remains same
  4. zero
As compare to beryllium, magnesium is
  1. less electropositive
  2. more electropositive
  3. large in size
  4. both B and C
The ozone layer restricts
  1. visible light
  2. infrared radiation
  3. x-rays and gamma rays
  4. ultraviolet radiation
Boron is a
  1. metal
  2. metalloid
  3. non-metal
  4. gas
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