Class XI

In graph of decrease in mass against time, fastest reaction shows
  1. steepest curve
  2. less steep
  3. flat curve
  4. a plateau
 Purpose of Lean Burn engines is to
  1. Produce less air pollution
  2. Consume lesser oxygen
  3. Produce more efficient fuel combustion
  4. Use them in sky rockets
Sugar cubes dissolve more slowly in hot drink than granulated sugar because
  1. Sugar cubes dissolve more slowly in hot drink than granulated sugar because
  2. Surface area of granulated sugar is more
  3. Sugar cubes are highly soluble
  4. Both A and B
Rate of reaction approx. doubles when temperature increases
  1. Approx. 50C
  2. Approx. 10 °C
  3. Approx. 15 °C
  4. Approx. 20 °C
Pure ice melts at exactly
  1. −100 °C
  2. zero °C
  3. 10 °C
  4. 20°C
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