Isolation of Elements

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

Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly?

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

The idea of froth floatation method came from a person X and this method is related to the process Y of ores. X and Y, respectively, are :

Consider two chemical reactions (A) and (B) that take place during metallurgical process: (A) $$ZnC{O_{3(s)}}\buildrel \Delta \over \longrightarrow Zn{O_{(s)}} + C{O_{2(g)}}$$ (B) $$2Zn{S_{(s)}} + 3{O_{2(g)}}\buildrel \Delta \over \longrightarrow 2Zn{O_{(s)}} + 2S{O_{2(g)}}$$ The correct option of names given to them respectively is :

In the leaching of alumina from bauxite, the ore expected to leach out in the process by reacting with NaOH is :

Match List I with List II : (Both having metallurgical terms) .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; overflow:hidden;padding:10px 5px;word-break:normal;} .tg th{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; font-weight:normal;overflow:hidden;padding:10px 5px;word-break:normal;} .tg .tg-amwm{font-weight:bold;text-align:center;vertical-align:top} .tg .tg-0lax{text-align:left;vertical-align:top} List - I List - II (a) Concentration of Ag ore (i) Reverberatory furnace (b) Blast furnace (ii) Pig iron (c) Blister copper (iii) Leaching with dilute NaCN solution (d) Froth floatation method (iv) Sulfide ores Choose the correct answer from the options given below :

Statement I : Leaching of gold with cyanide ion in absence of air / O₂ leads to cyano complex of Au(III). Statement II : Zinc is oxidized during the displacement reaction carried out for gold extraction. In the light of the above statements, choose the correct answer from the options given below.

Match List-I with List-II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; overflow:hidden;padding:10px 5px;word-break:normal;} .tg th{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; font-weight:normal;overflow:hidden;padding:10px 5px;word-break:normal;} .tg .tg-1wig{font-weight:bold;text-align:left;vertical-align:top} .tg .tg-0lax{text-align:left;vertical-align:top} List - I List - II (A) Concentration of gold ore (I) Aniline (B) Leaching of alumina (II) NaOH (C) Froth stabiliser (III) SO$$_2$$ (D) Blister copper (IV) NaCN Choose the correct answer from the options given below :

The role of depressants in 'Froth Flotation method' is to

Leaching of gold with dilute aqueous solution of NaCN in presence of oxygen gives complex [A], which on reaction with zinc forms the elemental gold and another complex [B]. [A] and [B], respectively are :

Which of the reaction is suitable for concentrating ore by leaching process ?

The methods NOT involved in concentration of ore are A. Liquation B. Leaching C. Electrolysis D. Hydraulic washing E. Froth floatation Choose the correct answer from the options given below :

Given below are two statements : Statement I : In froth floatation method of rotating paddle agitates the mixture to drive air out of it. Statement II : Iron pyrites and generally avoided for extraction of iron due to environmental reasons. In the light of the above statements, choose the correct answer from the options given below :

Which one of the following is not an example of calcination?

The ore that contains both iron and copper is :

Given below are two statements : Statement I : In the metallurgy process, sulphide ore is converted to oxide before reduction. Statement II : Oxide ores in general are easier to reduce. In the light of the above statements, choose the most appropriate answer from the options given below:

Which of the following is used as a stabilizer during the concentration of sulphide ores?

With respect to an ore, Ellingham diagram helps to predict the feasibility of its.