Class VII

Dry ice are cold crystals to keep things cold which are of
  1. carbon dioxide
  2. oxygen
  3. helium
  4. nitrogen
Fire extinguishers are filled with a gas called
  1. carbon dioxide
  2. oxygen
  3. helium
  4. nitrogen
Mineral water is mixture of many
  1. minerals
  2. metals
  3. gases
  4. compounds
Ink has different constituents which are soluble in
  1. water
  2. alcohol
  3. both a and b
  4. chemical
Melting point of sodium is
  1. 98
  2. 101
  3. -101
  4. 801
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