Concentration of Ores
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CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

320953 When \(\mathrm{\mathrm{ZnS}}\) and \(\mathrm{\mathrm{PbS}}\) minerals are present together, then \(\mathrm{\mathrm{NaCN}}\) is added to separate them in the froth-floatation process as a depressant, because :

1 \(\mathrm{\mathrm{Pb}(\mathrm{CN})_{2}}\) is precipitated, while no effect on \(\mathrm{\mathrm{ZnS}}\)
2 ZnS forms soluble complex \({\text{N}}{{\text{a}}_{\text{2}}}\left[ {{\text{Zn(CN}}{{\text{)}}_{\text{4}}}} \right]\)
3 \(\mathrm{\mathrm{PbS}}\) forms soluble complex \({\text{N}}{{\text{a}}_{\text{2}}}\left[ {{\text{Pb(CN}}{{\text{)}}_{\text{4}}}} \right]\)
4 They cannot be separated by adding \(\mathrm{\mathrm{NaCN}}\)
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

320954 Which of the following is commonly used to produce foam in froth floatation process?

1 Pine oil
2 Cresol
3 \(\mathrm{\mathrm{NaCN}}\)
4 Xanthate
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

320955 In the froth flotation process of concentration of ores, the ore particles float because they:

1 Are light
2 Are insoluble
3 Have the surface which is not wetted easily
4 Have a constant electrical charge
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

320956 Gravity separation method is based upon

1 Preferential washing of ores and gangue particles
2 Difference in densities of ore particles and impurities
3 Difference in chemical properties of ore particles and impurities
4 Difference in magnetic properties of gaunge and ore particles
NEET DIGITAL LIBRARY
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

320953 When \(\mathrm{\mathrm{ZnS}}\) and \(\mathrm{\mathrm{PbS}}\) minerals are present together, then \(\mathrm{\mathrm{NaCN}}\) is added to separate them in the froth-floatation process as a depressant, because :

1 \(\mathrm{\mathrm{Pb}(\mathrm{CN})_{2}}\) is precipitated, while no effect on \(\mathrm{\mathrm{ZnS}}\)
2 ZnS forms soluble complex \({\text{N}}{{\text{a}}_{\text{2}}}\left[ {{\text{Zn(CN}}{{\text{)}}_{\text{4}}}} \right]\)
3 \(\mathrm{\mathrm{PbS}}\) forms soluble complex \({\text{N}}{{\text{a}}_{\text{2}}}\left[ {{\text{Pb(CN}}{{\text{)}}_{\text{4}}}} \right]\)
4 They cannot be separated by adding \(\mathrm{\mathrm{NaCN}}\)
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

320954 Which of the following is commonly used to produce foam in froth floatation process?

1 Pine oil
2 Cresol
3 \(\mathrm{\mathrm{NaCN}}\)
4 Xanthate
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

320955 In the froth flotation process of concentration of ores, the ore particles float because they:

1 Are light
2 Are insoluble
3 Have the surface which is not wetted easily
4 Have a constant electrical charge
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

320956 Gravity separation method is based upon

1 Preferential washing of ores and gangue particles
2 Difference in densities of ore particles and impurities
3 Difference in chemical properties of ore particles and impurities
4 Difference in magnetic properties of gaunge and ore particles
Join With Us for More Updates
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

320953 When \(\mathrm{\mathrm{ZnS}}\) and \(\mathrm{\mathrm{PbS}}\) minerals are present together, then \(\mathrm{\mathrm{NaCN}}\) is added to separate them in the froth-floatation process as a depressant, because :

1 \(\mathrm{\mathrm{Pb}(\mathrm{CN})_{2}}\) is precipitated, while no effect on \(\mathrm{\mathrm{ZnS}}\)
2 ZnS forms soluble complex \({\text{N}}{{\text{a}}_{\text{2}}}\left[ {{\text{Zn(CN}}{{\text{)}}_{\text{4}}}} \right]\)
3 \(\mathrm{\mathrm{PbS}}\) forms soluble complex \({\text{N}}{{\text{a}}_{\text{2}}}\left[ {{\text{Pb(CN}}{{\text{)}}_{\text{4}}}} \right]\)
4 They cannot be separated by adding \(\mathrm{\mathrm{NaCN}}\)
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

320954 Which of the following is commonly used to produce foam in froth floatation process?

1 Pine oil
2 Cresol
3 \(\mathrm{\mathrm{NaCN}}\)
4 Xanthate
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

320955 In the froth flotation process of concentration of ores, the ore particles float because they:

1 Are light
2 Are insoluble
3 Have the surface which is not wetted easily
4 Have a constant electrical charge
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

320956 Gravity separation method is based upon

1 Preferential washing of ores and gangue particles
2 Difference in densities of ore particles and impurities
3 Difference in chemical properties of ore particles and impurities
4 Difference in magnetic properties of gaunge and ore particles
For More Updates join with Us
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

320953 When \(\mathrm{\mathrm{ZnS}}\) and \(\mathrm{\mathrm{PbS}}\) minerals are present together, then \(\mathrm{\mathrm{NaCN}}\) is added to separate them in the froth-floatation process as a depressant, because :

1 \(\mathrm{\mathrm{Pb}(\mathrm{CN})_{2}}\) is precipitated, while no effect on \(\mathrm{\mathrm{ZnS}}\)
2 ZnS forms soluble complex \({\text{N}}{{\text{a}}_{\text{2}}}\left[ {{\text{Zn(CN}}{{\text{)}}_{\text{4}}}} \right]\)
3 \(\mathrm{\mathrm{PbS}}\) forms soluble complex \({\text{N}}{{\text{a}}_{\text{2}}}\left[ {{\text{Pb(CN}}{{\text{)}}_{\text{4}}}} \right]\)
4 They cannot be separated by adding \(\mathrm{\mathrm{NaCN}}\)
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

320954 Which of the following is commonly used to produce foam in froth floatation process?

1 Pine oil
2 Cresol
3 \(\mathrm{\mathrm{NaCN}}\)
4 Xanthate
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

320955 In the froth flotation process of concentration of ores, the ore particles float because they:

1 Are light
2 Are insoluble
3 Have the surface which is not wetted easily
4 Have a constant electrical charge
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

320956 Gravity separation method is based upon

1 Preferential washing of ores and gangue particles
2 Difference in densities of ore particles and impurities
3 Difference in chemical properties of ore particles and impurities
4 Difference in magnetic properties of gaunge and ore particles
NEET DIGITAL LIBRARY