Which of the following is not correct?

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(D) $1$. Froth floatation is based on the principle of differential wettability of ore and gangue particles by oil and water. This is correct.$2$. $Na

Vedclass · Accepted Answer

Malachite is an ore of $Zn$.

Vedclass · Answer

(D) $1$. Froth floatation is based on the principle of differential wettability of ore and gangue particles by oil and water. This is correct.$2$. $NaCN$ is used as a depressant to selectively prevent $ZnS$ from forming froth in the presence of $PbS$. This is correct.$3$. Calamine is $ZnCO_3$,which is a carbonate ore. This is correct.$4$. Malachite is a copper ore with the formula $CuCO_3 \cdot Cu(OH)_2$. Therefore,the statement that it is an ore of $Zn$ is incorrect.

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