Question

why is it wise to Neutralise the factor wastes before depositing of them into river or lake

Answer 1

it is important to neutralize factory's waste before letting it in river or lake because
1. active substnances can react with others and can contaminate the water
2. neutralising waste will reduce danger of explosions of radio active substances

Answer 2

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The factory waste contain harmful acids and bases. if these waste are allowed to flow directly into the water bodies, they may harm aquatic plants and animals. therefore, it is wise to neutralize the factory waste before disposing them off into rivers or lakes.