সোনায় মরিচা ধরে না কারণ সোনা অনেকটা নিষ্ক্রিয় ধাতু।
লোহা বাবা লোহা জাতীয় পদার্থ কে আর্দ্র বাতাসে উন্মুক্ত স্থানে দীর্ঘদিন রেখে দিলে ওই পদার্থের উপরে বাদামী বর্ণের একটি আস্তরণ পড়ে। এ কে মরিচা (nH2O.Fe2O3) বলে। মূলত লোহা বাবা লোহা জাতীয় পদার্থ বাতাসের জলীয় বাষ্প ও অক্সিজেনের সাথে আর্দ্র ফেরিক অক্সাইড উৎপন্ন করে। সোনা একটি বিশুদ্ধ মৌলিক পদার্থ যা সাধারণ অবস্থায় কোন মৌলের সাথে বিক্রিয়া করে না অর্থাৎ সোনায় মরিচা ধরে না।
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