Sulfur dioxide and nitrogen dioxide are among the pollutants commonly found in t

Question

Sulfur dioxide and nitrogen dioxide are among the pollutants commonly found in the atmosphere. Sulfur dioxide may originate from natural activities such as volcanic eruptions or anthropogenic activities such as burning of fuels or metallurgical processes used to obtain metals from sulphides, such as the roasting of chalcopyrite whose reaction equation is shown Next.

Most of the nitrogen dioxide in the air is a
Oxidation of nitrogen monoxide by O2 or O3 or
The burning of fossil fuels.
From the information in the text, check the incorrect option. (Justify the correct answer and the wrong answer).

Explanation / Answer

A) Sulfur oxide and nitrogen oxide gives soulfuric acid and nitric acid when dissolved in water. Thus, they are acidic oxides.

B) Chalcopyrite contains iron sulfide and copper sulfide hence it is a double sulfide

C) In CuFeS2 , sulfur is in -2 oxidation state (+2+2+2x = 0 implies x=-2) and S is in +2 oxidation state in SO2 as x+2*(-2)= 0 implies that x = +4. This statement is not true.

D) The equation is roasting - burning in presence of oxygen but HgS formula is not required to tell the reaction process in the reaction is 'roasting'.

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