Class VII

When substance combines with oxygen while burning reaction is termed as
  1. combustion
  2. burning
  3. both a and b
  4. evaporation
If both water and carbon dioxide is given to plant still it will not prepare its own food if there is lack of
  1. sugar
  2. soil
  3. sunlight
  4. fertilizers
Dilute acids and alkalis react together to form
  1. salt
  2. water
  3. both a and b
  4. gases
. If two or more substances combine to form a new substance chemical reaction is termed as
  1. thermal decomposition
  2. combination
  3. addition
  4. combustion
A fuel formed from a fossil is known as
  1. decayed animal
  2. decayed plants
  3. fossil fuels
  4. crude oil
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