CBSE Class-7 Science: Questions 117 - 124 of 322
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Question number: 117
Question number: 118
Question number: 119
Question number: 120
Question number: 121
Question number: 122
Question number: 123
Question number: 124
The waste of factories must be treated before it allowed to flow into rivers why?
To neutralise the harmful effect of carbon dioxide
To neutralise bases present in the waste
To neutralise acids present in waste
|d.||Question does not provide sufficient data or is vague|