Class IX

When halogens are exposed to sunlight, they split up in to
  1. atoms
  2. ions
  3. radicals
  4. molecules
Biochemistry deals with
  1. physical changes in humans
  2. chemical changes in humans
  3. A and B both
  4. physical and chemical changes in living organisms
Gram atomic mass of Zn is
  1. 23g
  2. 12g
  3. 63.54g
  4. 56.67g
Branch of chemistry which deals with substance containing carbon is called
  1. carbon chemistry
  2. inorganic chemistry
  3. organic chemistry
  4. environmental chemistry
A hydrogen atom is
  1. 8.40% as massive as C-12
  2. 10% as massive as C-12
  3. 20% as massive as C-12
  4. 30% as massive as C-12
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