Question

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Answer 1

Explanation:

ans 9

C).. 1. it is used to make drink if water free from germs.

2. It is used to bleach clothes in textile industry and wood pulp in paper industry.

Ans 10.

Our body works at a pH of 7.4 . The blood maintains a pH of 7.4. It may be more or less depending on the function of the organ.

eg. In stomach pH is acidic for enzymes to work.