Froth Floatation

Q. minimum % labelling of oleum

Q.

Define loading. Name the chemical substance that is used for loading?

Q. Which of the following is commonly used to produce foam in froth floatation process?

1. Pine oil
2. Cresol
3. $NaCN$
4. Xanthate

Q.

The ore that is not concentrated by froth floatation is:

1. Galena

2. Copper pyrite

3. Sphalerite

4. Argentite

Q.

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

1. Horn silver

2. Bauxite

3. Cinnabar

4. Haematite

Q. 10.Two moles of pcl5 when heated in a closed vessel of 2 L capacity is found to attain equilibrium when 60 %of pcl5 was decomposed. The kc of the reaction is

Q. ntIf the reactants are CH4 + 2O2 and we need to count number of moles of reactants , will it be 1mole of methane+ 2 moles of oxygen = 3 moles of reactantsn ntOr do we have to calculate individually for carbon , oxygen and hydrogen?n

Q. 24 How many moles of hydrogen are needed if it reacts with nitrogen to form 6 moles of ammonia with 80% yield?

Q. The main function of a frother is:

1. None of these
2. To stick to the ore and then take it to the top
3. To make the insoluble ore soluble
4. To make the ore hydrophobic

Q.

Why LiHCO₃ does not exist as solid?

Q. What is the role of aniline or cresol when added in a froth floatation process?

Q. Consider the following statements: Roasting is carried out to :
(i) Convert sulphide to metal oxides and $S{O}_2$
(ii) Remove water of hydration
(iii) melt the ore
(iv) Remove arsenic and sulphur impurities

1. 
   (i), (ii) and (iii) are correct
2. 
   (i) and (iv) are correct
3. 
   (i), (ii) and (iv) are correct
4. 
   (ii), (iii) and (iv) are correct.

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 $A{l}_2{O}_3.2H_{2}O$