Class VI

Ammonia molecule contains one nitrogen atom and three atoms of
  1. hydrogen
  2. helium
  3. nitrogen
  4. carbon
In a comparison with a gold atom and hydrogen atom, gold atom is
  1. smaller
  2. larger
  3. medium
  4. same
O3 is chemical formula of
  1. oxygen
  2. oxides
  3. ozone
  4. acid rain
. Most part of an atom is
  1. empty
  2. filled
  3. charged
  4. covered
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