Silver articles become black after some time when exposed to air because

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Submitted by examrobotsa on

Q: (CDS-I/2020)
Silver articles become black after some time when exposed to air because
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question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,32,34,19,7,32,8

keywords: 

{'silver reacts': [0, 0, 0, 1], 'silver articles': [0, 0, 0, 1], 'silver oxide': [0, 0, 0, 1], 'silver carbonate': [0, 0, 0, 1], 'silver sulphide': [0, 0, 0, 1], 'silver': [0, 0, 0, 1], 'coating': [0, 0, 0, 2], 'nitrogen oxides': [0, 0, 0, 1], 'air': [1, 0, 0, 0], 'sulphur': [0, 0, 0, 2], 'moist carbon dioxide': [0, 0, 0, 1]}