Froth Floatation

Q.

Froth floatation can be applied to non-sulphide ores.

1. True

2. False

Q.

Assertion: In froth flotation process sodium ethyl xanthate is used as collector.

Reason: Sulphide ores are water soluble.

1. Assertion is correct but the reason is wrong

2. Assertion is incorrect but the reason is correct

3. Both assertion and reason are correct and the reason is the correct explanation for the assertion.

4. Both assertion and reason are correct but the reason is not the correct explanation for the assertion.

Q.

Generally, for which of the following ores, froth floatation method is used for concentration?

1. Horn silver

2. Bauxite

3. Haematite

4. Cinnabar

Q. Which one of the following ores is best concentrated by froth floatation method?

1. Galena
2. Siderite
3. Malachite
4. Magnetite

Q. Which of the following methods are used for concentration of ores?

1. Gravity seperation
2. Froth floatation
3. Roasting
4. Calcination

Q. Which of the following ores is best concentrated by froth floatation?

1. Magnetite
2. Galena
3. Malachite
4. Siderite

Q. Froth floatation process used for the concentration of sulphide ore:

1. Is based on the difference in wettability of different minerals
2. Uses flouspar for concentrating
3. Uses sodium chloride as depressent
4. Uses mustard oil as frothing agent

Q.

The ore that is not concentrated by froth floatation is:

1. Sphalerite

2. Argentite

3. Galena

4. Copper pyrite

Q. $NaCN$ is sometimes added in the froth flotation process as a depressant when $ZnS$ and $PbS$ are to be separated in the given sample because:

1. $Pb(CN{)}_2$ is precipitated, no effect on $ZnS$
2. $ZnS$ forms a soluble complex, $PbS$ goes up with the froth
3. $NaCN$ reacts with $ZnS$ to form $N{a}_2\left[Zn\right(CN{)}_4]$
4. $Zn(CN{)}_2$ is precipitated, no effect on $PbS$

Q. Froth flotation $\to$Roasting$\to$Reduction$\to$Electrolysis
The above processes are used in the extraction of:

1. Cu from $CuFe{S}_2$
2. Zn from $ZnS$
3. Fe from $F{e}_2{O}_3$
4. Al from $A{l}_2{O}_3.2H_{2}O$