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Silver articles become black after some time when exposed to air because चाँदी की वस्तुएँ हवा में खुली रखने पर कुछ समय बाद काली होने लगती है। ऐसा इसलिए होता है‚ क्योंकि

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Silver articles become black after some time when exposed to air because चाँदी की वस्तुएँ हवा में खुली रखने पर कुछ समय बाद काली होने लगती है। ऐसा इसलिए होता है‚ क्योंकि






 
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