Correct answer: (a) Both statement II and Statement III are correct and both of them explain Statement I
Explanation
- A
Both statement II and Statement III are correct and both of them explain Statement I
Both Statement II and Statement III are correct and both explain Statement I. Activated carbon has a very large surface area and adsorbs heavy metals (II) - that is why it pulls pollutants from effluent. It can be made from high-carbon wastes such as coconut shell or rachis (III) - that is why it is a cheap, attractive tool. I follows from both.
- B
Both Statement II and Statement III are correct but only one of them explains Statement I
Both II and III are correct but only one explains I. Both do: adsorption chemistry and cheap feedstock are two reasons it is used.
- C
Only one of the Statements II and III is correct and that explains Statement I
Only one of II and III is correct and that explains I. Both II and III hold.
- D
Neither Statement II nor Statement III is correct.
Neither II nor III is correct. Both hold, and both support I.
Summary. Official key is (a): both II and III are correct and both explain I. Activated carbon’s huge surface adsorbs metals, and it can be made from high-carbon wastes — that is why it is used on effluent.
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