Class IX

If we burn graphite,
  1. residue will be left
  2. no residue will be left
  3. it will not burn
  4. it will change into diamond.
Anemometer measures
  1. Amount of haemoglobin in blood
  2. Pollination of plant by the wind
  3. Wind resistance
  4. Wind speed.
Mixture can be
  1. homogeneous
  2. heterogeneous
  3. Both of these
  4. pure substance
1 carat of diamond is equal to
  1. 200mg
  2. 200g
  3. 100mg
  4. 100g
Which of the following is a chemical change ?
  1. Melting of ice
  2. Rusting of iron
  3. Dissolving salt in water
  4. Boiling of water into steam
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