A concentrated ore (X) of a transition metal is roasted in air to produce a gas (G) that turns acidified green. The roasted product undergoes self-reduction at high temperatures to yield a metal that

Question

A concentrated ore (X) of a transition metal is roasted in air to produce a gas (G) that turns acidified $K_2Cr_2O_7$ green. The roasted product undergoes self-reduction at high temperatures to yield a metal that develops a blistered appearance upon cooling. What is the primary chemical identity of ore (X)?

Prashant Kotian · Accepted Answer

Correct answer: D. The gas (G) that turns acidified dichromate green is , indicating a sulphide ore. The metal undergoes self-reduction and forms "blisters" due to escaping gas upon cooling. This is the defining characteristic of Blister Copper, extracted from copper sulphide ores like Copper glance () or Chalcopyrite.

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