Correct answer: (a) Sodium chlorate
Explanation
- A
Sodium chlorate
Sodium chlorate is a non-selective herbicide and defoliant (also an oxidiser). Among the given chemicals it is the example of a herbicide, so (a) is the official key.
- B
Potassium permanganate
Potassium permanganate is a strong oxidising disinfectant and titrant, not used as a field herbicide in this list.
- C
Bleaching powder
Bleaching powder (CaOCl2) is a disinfectant and bleaching agent, not classified here as a herbicide.
- D
None of the above
‘None of the above’ fails because sodium chlorate is a herbicide.
Summary. Official key is (a) sodium chlorate. KMnO4 and bleaching powder are oxidisers/disinfectants, not the herbicide example on this list.
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