Q.3 MnO2 is a /MnO2 है *
1 DeColouring substance/ रंगनाशक पदार्थ
2 Colouring substance/ रंगउत्पादक पदार्थ
3 Acid/अम्ल
4 Above 1,2,3/ उपरोक्त तीनों
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