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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
  • a)
    Oxidising agent
  • b)
    REducing agent
  • c)
    Oxidising and reducing agent
  • d)
    Fluxing agent
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Amongst the various ores of a metal (M) (sulphide, carbonates, oxides,...
G1 = SO2 ; sulphur can increase & decrease its oxidation state.
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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 asa)Oxidising agentb)REducing agentc)Oxidising and reducing agentd)Fluxing agentCorrect answer is option 'C'. Can you explain this answer?
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