चांदी काली क्यों पड़ती💐| संक्षारण । चिप्स में नाइट्रोजन क्यो ।Corrosion and Rancidity #क्लास10 #ncert

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Видео चांदी काली क्यों पड़ती💐| संक्षारण । चिप्स में नाइट्रोजन क्यो ।Corrosion and Rancidity #क्लास10 #ncert канала SANJAY RAO TEACH