Which of the following statements is not corr | vedclass

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(D) Froth-flotation is a process used for the concentration of sulphide ores. $(i)$ Froth-flotation is indeed used for removing gangue from sulphide o

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$(iv)$

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(D) Froth-flotation is a process used for the concentration of sulphide ores. $(i)$ Froth-flotation is indeed used for removing gangue from sulphide ores. $(ii)$ Cresols and aniline are used as froth stabilizers. $(iii)$ Sodium cyanide $(NaCN)$ is used as a depressant to separate $ZnS$ from $PbS$. $(iv)$ Aniline is used as a froth stabilizer,not as a froth enhancer. Froth enhancers are substances like pine oil or fatty acids. Therefore,statement $(iv)$ is incorrect.

Which of the following statements is not correct?
$(i)$ Froth-floatation is used for removing gangue from sulphide ore.
$(ii)$ Cresols are used to stabilise the froth.
$(iii)$ Sodium cyanide can be used as depressant for preferential separation.
$(iv)$ Aniline can be used as froth enhancer.

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Which of the following statements is not correct?$(i)$ Froth-floatation is used for removing gangue from sulphide ore.$(ii)$ Cresols are used to stabilise the froth.$(iii)$ Sodium cyanide can be used as depressant for preferential separation.$(iv)$ Aniline can be used as froth enhancer.