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Thursday, June 6, 2019
कॉपर चूर्ण को वायु में गर्म करने पर उसके सतह पर कॉपर ऑक्साइड की एक परत जम जाती है । इस परत का रंग कैसा है ?
(A) काला
(B) श्वेत
(C) पीला
(D) भूरा
Ans (A)
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