Paheli observed that most of the fish in the pond of her village were gradually dying

cbse
acids-bases-salts
cbse-class-7-science

#1

Paheli observed that most of the fish in the pond of her village were gradually dying. She also observed that the waste of a factory in their village is flowing into the pond which probably caused the fish to die.

  • Explain why the fish were dying.
  • If the factory waste is acidic in nature, how can it be neutralised?

Answer:

  • Since factory waste may contain acids or bases, it can kill the fish.
  • If the factory waste is acidic in nature, it can be neutralised by adding basic substances like quicklime or slaked lime.