Home › Maharashtra SSC (Class 10) › Chemistry › Metallurgy › Why do silver articles turn blackish after long …
Why do silver articles turn blackish after long exposure to air?
AFormation of a silver sulphide layer
BFormation of a silver carbonate layer
CFormation of a silver oxide layer
DFormation of a silver chloride layer
Answer & Solution
Correct answer: A. Formation of a silver sulphide layer
1. Air contains traces of hydrogen sulphide.
2. Silver reacts with this hydrogen sulphide over time.
3. A black layer of silver sulphide (Ag2S) forms on the surface, turning it blackish.
4. The greenish copper layer is a carbonate, not the cause for silver, so that option is wrong.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 8 "Metallurgy", p.115_
Related questions
Metallurgy is the process of:Bronze, an alloy resistant to sun and rain, is made from which composition?An alloy in which one of the constituent metals is mercury is given which special name?In electroplating, what is coated onto a more reactive metal by electrolysis?In anodization of aluminium, the article is made the anode so that a protective layer of wDepositing a layer of molten tin on a metal surface, popularly called 'kalhaee', is known In galvanizing, why does the zinc layer corrode before the iron beneath it?In galvanizing, a thin layer of which metal is applied to protect iron or steel?