Class VI

. Most part of an atom is
  1. empty
  2. filled
  3. charged
  4. covered
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
Ammonia molecule contains one nitrogen atom and three atoms of
  1. hydrogen
  2. helium
  3. nitrogen
  4. carbon
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