Combustion and flame

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Across
  1. 6. dry powder of chemical is used in fire extinguisher.
  2. 8. a temperature at which substances catches fire is called.
  3. 9. zone unburnt carbon particle are present.
  4. 11. most corrosive gas
Down
  1. 1. caused by increased concentrate of carbon dioxide.
  2. 2. amount of energy produced on complete combustion of 1 kg of fuel.
  3. 3. substance which catches fire at very low temperature
  4. 4. used for fire extinguish due to electricity or oil.
  5. 5. a chemical process in which a substance reacts with oxygen to give off heat.
  6. 7. rain oxides of sulphur and nitrogen dissolves in rainwater to produce.
  7. 10. non metal which catches fire if exposed to air.