Which of the following statements is correct about the role of subs...

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Which of the following statements is correct about the role of substances added in the froth floation process?
(i) Collectors enhance the non-wettability of the mineral particles.
\( \mathrm{P} \)
(ii) Collectors enhance the wettability of gangue particles.
W
(iii) By using depressants in the process two sulphide ores can be separated.
(iv) Froth stabilisers decrease wettability of gangue.
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