Advertisements
Advertisements
Question
Silver metal does not combine easily with oxygen but silver jewellery tarnishes after some time. How?
Solution
Silver metal does not react with oxygen but reacts with hydrogen sulphide gas in the air and forms a thin black layer of silver sulphide (Ag2S) on it. Therefore, silver jewellery or ornaments tarnish due to the formation of a silver sulphide coating on their surfaces.
APPEARS IN
RELATED QUESTIONS
Name the most abundant metal in the earth's crust.
Give two uses of bronze.
Which metal is extracted from cinnabar ore?
A sulphide ore is converted into metal oxide by the process of:
(a) carbonation
(b) roasting
(c) calcination
(d) anodising
Name the following:
The process of heating a substance very strongly in such a way that it does not combine with oxygen.
Name the following:
The process in which an ore is heated in air so that oxygen gets added to it to form the oxides.
Correct the following statement :
Copper reacts with nitric acid to produce nitrogen dioxide.
Name the following :
The Process of heating an ore to a high temperature in the presence of air.
In the electrolytic method, a layer of highly active metal is applied to a less active metal.
Complete flow chart given below.
