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Formation of metallic copper from the sulphide ore in the commercial thermo-metallurgical process essentially involves which one of the following reaction :

Ag₂S + NaCN + Zn →Ag

This method of extraction of Ag by complex formation and then its displacement is called :

Calcination is the process of heating the ore :

Which of the following does not contain Mg :

Match the method of concentration of the ore in column I with the ore in column II and select the correct alternate:

Bessemerization is carried out for

(I) Fe
(II) Cu
(III) Al
(IV) silver

Refining of silver is done by :

Which of the following is not used for obtaining Ag

Blister Cu is about :

Which one of the following is not a method of concentration of ore?

In which of the following isolations no reducing agent is required :

Chemical leaching is useful in the concentration of :

The element which could be extracted by electrolytic reduction of its oxide dissolved in a high temperature melt is :

Consider the following statements :

Roasting is carried out to :

(i) convert sulphide to oxide and sulphate (ii) remove water of hydration

(iii) melt the ore (iv) remove arsenic and sulphur impurities

Of these statements :

Iron obtained from blast furance is :

Which one of the following statements is not correct :

Which of the following is not an ore :

In the extraction of nickel by Mond process, the metal is obtained by :

B₄C(boron carbide) is used except:

Froath floatation process is based on:

When ZnS and PbS minerals are present together, then NaCN is added to separate them in the froth floatation process as a depressant, because

When copper is purified by electrorefining process, noble metals like Ag and Au are found in

Formation of Ni(CO)₄ and subsequent its decomposition into Ni and CO (recycled) makes basis of Mond's process

Ni + 4CO  Ni (CO)₄   Ni + 4CO

T₁ and T₂ are :

Match column–I (process) with column–II (electrolyte) :

Choose the correct alternate.

(I) FeCr₂O₄ + NaOH + air → (A) + Fe₂O₃

(II) (A) + (B) → Na₂Cr₂O₇

(III) Na₂Cr₂O₇ + X  Cr₂O₃

(IV) Cr₂O₃ + Y  Cr

Q.

Compounds (A) and (B) are :

(I) FeCr₂O₄ + NaOH + air → (A) + Fe₂O₃

(II) (A) + (B) → Na₂Cr₂O₇

(III) Na₂Cr₂O₇ + X  Cr₂O₃

(IV) Cr₂O₃ + Y  Cr

Q.

(X) and (Y) are :

(I) FeCr₂O₄ + NaOH + air → (A) + Fe₂O₃

(II) (A) + (B) → Na₂Cr₂O₇

(III) Na₂Cr₂O₇ + X  Cr₂O₃

(IV) Cr₂O₃ + Y  Cr

Q.

Na₂CrO₄ and Fe₂O₃ are separated by :

(I) FeCr₂O₄ + NaOH + air → (A) + Fe₂O₃

(II) (A) + (B) → Na₂Cr₂O₇

(III) Na₂Cr₂O₇ + X  Cr₂O₃

(IV) Cr₂O₃ + Y  Cr

Q.

High temperature (> 1000ºC) electrolytic reduction is necessary for isolating :

In froth-floatation process, palm oil functions as :

Collector are the substances which help in attachement of an ore particle to air bubble in froth. A popular collector used industrially is :