MET MCQ -1 (Advanced) - JEE MCQ
15 Questions MCQ Test - MET MCQ -1 (Advanced)
In which of the following pair(s), the minerals are converted in to metals by self-reduction process?
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The reaction(s) which does (do) not occur in the reduction zone in the extraction of iron from haematite ore is(are):
Why lime stone is added in the extraction of lead from galena?
The role of fluorspar (CaF2) which is added in the electrolytic reduction of alumina dissolved in fused cryolite is(are):
Which of the following statement(s) is (are) correct about slag?
Minerals from which metals can be extracted economically and easily are called ores.
The extraction of metals from their ores involves the following processes. (i) Concentration (ii) Calcination | roasting | leaching. (iii) Reduction.
It is carried out by one of the following methods. (A) Carbon | out by one of the following methods (B) Self reduction. (C) Electrolytic reduction. (D) Reduction by more electropositive metal (i.e. displacement method).
Q.
Which of the following reactions does not occur in Bessemer converter in the extraction of copper from chalcopyrites?
Minerals from which metals can be extracted economically and easily are called ores.
The extraction of metals from their ores involves the following processes. (i) Concentration (ii) Calcination | roasting | leaching. (iii) Reduction.
It is carried out by one of the following methods. (A) Carbon | out by one of the following methods (B) Self reduction. (C) Electrolytic reduction. (D) Reduction by more electropositive metal (i.e. displacement method).
Q.
Silver is extracted from its native ore by;
Minerals from which metals can be extracted economically and easily are called ores.
The extraction of metals from their ores involves the following processes. (i) Concentration (ii) Calcination | roasting | leaching. (iii) Reduction.
It is carried out by one of the following methods. (A) Carbon | out by one of the following methods (B) Self reduction. (C) Electrolytic reduction. (D) Reduction by more electropositive metal (i.e. displacement method).
Q.
Which of the following is not correctly method?
Metallic gold frequently is found in aluminosilicate rocks and it is finely dispersed among other minerals. It may be extracted by treating the crushed rock with aerate potassium cyanide solution. During this process metallic gold is slowly converted to [Au(CN)2]-, which is soluble in water. After equilibrium has been reached the aqueous phase is umped off and the metallic gold is recovered from it by reacting the gold complex with zinc, which is converted to [Zn(CN)4]2-. Gold in nature is frequently alloyed with silver which is also oxidized by aerated sodium cyanide solution. Silver occurs as native as well as sulphurised ore.
Q.
The correction reaction involved in the leaching of gold with dilute solution of NaCN is :
Metallic gold frequently is found in aluminosilicate rocks and it is finely dispersed among other minerals. It may be extracted by treating the crushed rock with aerate potassium cyanide solution. During this process metallic gold is slowly converted to [Au(CN)2]-, which is soluble in water. After equilibrium has been reached the aqueous phase is umped off and the metallic gold is recovered from it by reacting the gold complex with zinc, which is converted to [Zn(CN)4]2-. Gold in nature is frequently alloyed with silver which is also oxidized by aerated sodium cyanide solution. Silver occurs as native as well as sulphurised ore.
Q.
The process described above in the passage is regarding :
Amongst the various ores of a metal (M) (sulphide, carbonates, oxides, hydraed or hydroxides) two ores [X] and [Y] show the following reactivity.
(i) [X] On calcinations gives a black solid (S), carbon dioxide and water.
(ii) [X] Dissolved in dil. HCl on reaction with KI gives a white precipitate (P) and iodine.
(iii) [Y] On roasting gives metal (M) and a gas (G1) which turns acidified K2Cr2O7 solution green.
(iv) [Y] On reaction with dil. HCl gives a white precipitate (Q) and another gas (G2) which turns lead acetate solution black and also reacts with gas (G1) to precipitate colloidal sulphur in presence of moisture. The M, S [X] and [Y] gives greenish blue flame.
Q.
The metal ores [X] and [Y] are respectively;
Amongst the various ores of a metal (M) (sulphide, carbonates, oxides, hydraed or hydroxides) two ores [X] and [Y] show the following reactivity.
(i) [X] On calcinations gives a black solid (S), carbon dioxide and water.
(ii) [X] Dissolved in dil. HCl on reaction with KI gives a white precipitate (P) and iodine.
(iii) [Y] On roasting gives metal (M) and a gas (G1) which turns acidified K2Cr2O7 solution green.
(iv) [Y] On reaction with dil. HCl gives a white precipitate (Q) and another gas (G2) which turns lead acetate solution black and also reacts with gas (G1) to precipitate colloidal sulphur in presence of moisture. The M, S [X] and [Y] gives greenish blue flame.
Which of the following statements is correct about [Y]?
Amongst the various ores of a metal (M) (sulphide, carbonates, oxides, hydraed or hydroxides) two ores [X] and [Y] show the following reactivity.
(i) [X] On calcinations gives a black solid (S), carbon dioxide and water.
(ii) [X] Dissolved in dil. HCl on reaction with KI gives a white precipitate (P) and iodine.
(iii) [Y] On roasting gives metal (M) and a gas (G1) which turns acidified K2Cr2O7 solution green.
(iv) [Y] On reaction with dil. HCl gives a white precipitate (Q) and another gas (G2) which turns lead acetate solution black and also reacts with gas (G1) to precipitate colloidal sulphur in presence of moisture. The M, S [X] and [Y] gives greenish blue flame.
Q.
The gas (G1) acts as
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