Peetal Ke Bartan Ko Khule Me Rakhne Par Wah Kis Gas Ke Karan Ganda Ho Jata Hai ? पीतल के बर्तन को खुले में रखने पर वह किस गैस के कारण गंदा हो जाता है ?

पीतल के बर्तन को खुले में रखने पर वह किस गैस के कारण गंदा हो जाता है ?

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