Brass gets discoloured in air due to the presence of which gas in air?
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Brass gets discoloured in air due to the presence of which gas in air?
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Copper and Zinc combined to form Brass. In the presence of Hydrogen sulphide (H2S) Zn reacts with Hydrogen and form a compound Zinc Hydroxide of Ugly red colour and copper react with sulphur to form a black coloured compound copper sulphide and as a result of it brass gets discoloured. 

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