Amar covers a distance by car driving at 35 km/hr and he returns back to the
starting point riding on a scooter with a speed of 25 km/hr. Find the average speed
for the whole journey.
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The substance ‘X’ which is used in whitewashing is quick lime or Calcium Oxide and its formula is CaO.
ii) CaO + H2O → Ca(OH)2
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