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 :

Which of the following is structure of a separating funnel?

Given below are two statements : Statement I : According to Ellingham diagram, any metal oxide with higher $$\Delta$$G$${}^{\circ }$$ is more stable than the one with lower $$\Delta$$G$${}^{\circ }$$. Statement II : The metal involved in the formation of oxide placed lower in the Ellingham diagram can reduce the oxide of a metal placed higher in the diagram. In the light of the above statements, choose the most appropriate answer from the options given below :

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

Given below are two statements. Statement I : During electrolytic refining, blister copper deposits precious metals. Statement II : In the process of obtaining pure copper by electrolysis method, copper blister is used to make the anode. In the light of the above statements, choose the correct from the options given below.

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 following chemical reactions represents Hall-Heroult Process?

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-0pky{border-color:inherit;text-align:left;vertical-align:top} List - I List -II (A) Sphalerite (I) FeCO$${}_3$$ (B) Calamine (II) PbS (C) Galena (III) ZnCO$${}_3$$ (D) Siderite (IV) ZnS Choose the most appropriate answer from the options given below :

The compound(s) that is (are) removed as slag during the extraction of copper is : (A) CaO (B) FeO (C) Al2O3 (D) ZnO (E) NiO Choose the correct answer from the options given below:

Given below are two statements. Statement I : Pig iron is obtained by heating cast iron with scrap iron. Statement II : Pig iron has a relatively lower carbon content than that of cast iron. In the light of the above statements, choose the correct answer from the options given below.

Refining using liquation method is the most suitable for metals with :

The metal that is not extracted from its sulfide ore is :

Which of the following methods are not used to refine any metal? A. Liquation B. Calcination C. Electrolysis D. Leaching E. Distillation Choose the correct answer from the options given below:

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

In metallurgy the term "gangue" is used for :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : At 10$${}^{\circ }$$C, the density of a 5 M solution of KCl [atomic masses of K & Cl are 39 & 35.5 g mol$$-$$1 respectively], is 'x' g ml$$-$$1. The solution is cooled to $$-$$21$${}^{\circ }$$C. The molality of the solution will remain unchanged. Reason (R) : The molality of a solution does not change with temperature as mass remains unaffected with temperature. In the light of the above statements, choose the correct answer from the options given below :

Solute A associates in water. When 0.7 g of solute A is dissolved in 42.0 g of water, it depresses the freezing point by 0.2$${}^{\circ }$$C. The percentage association of solute A in water, is : [Given : Molar mass of A = 93 g mol$$-$$1. Molal depression constant of water is 1.86 K kg mol$$-$$1.]

For a solution of the gases A, B, C and D in water at 298 K, the values of Henry's law constant (KH) are 30.40, 2.34, 1.56 $$\times$$ 10$$-$$5 and 0.513 k bar respectively. In the given graph, the lines marked as 'p' and 's' correspond respectively to :

The depression in freezing point observed for a formic acid solution of concentration $$0.5\mathrm{mL}{\mathrm{L}}^{-1}$$ is $$0.0405^{\circ }\mathrm{C}$$. Density of formic acid is $$1.05\mathrm{g}{\mathrm{mL}}^{-1}$$. The Van't Hoff factor of the formic acid solution is nearly : (Given for water $${\mathrm{k}}_{\mathrm{f}}=1.86\mathrm{k}\mathrm{kg}{\mathrm{mol}}^{-1}$$ )