Q. 975.0( 1 Vote )

When an object made of metal A is kept in air for a considerable time, it loses its shine and becomes almost black due to the formation of a layer of substance B. When an object made of another metal C is kept in damp air for a considerable time, it gets covered with a green layer of substance D. Metal A is the best conductor of electricity whereas metal C is the next best conductor of electricity. (a) What is metal A?
(b) What is metal C?
(c) Name the substance B.
(d) Name the substance D.
(e) What type of chemical can be used to remove the green layer from metal C and clean it? Why?

Answer :

(a) Metal A is silver. Because when silver is kept in air for a considerable time, it loses its shine and becomes almost black due to the formation of a layer of silver sulphide.

(b) The name of the metal C is copper.

(c) The name of the substance is silver sulphide.

(d) The name of the substance D is basic copper carbonate.

(e) Dilute acidic solution can be used to remove the green layer from metal C and clean it because the acid solution dissolves green coloured basic copper carbonate present on the corroded copper object makes it look shiny, red brown again.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Champ Quiz | Corrosion: Types, Pros and ConsChamp Quiz | Corrosion: Types, Pros and ConsChamp Quiz | Corrosion: Types, Pros and Cons29 mins
Quiz | Physical Properties of Metals and Non-MetalsQuiz | Physical Properties of Metals and Non-MetalsQuiz | Physical Properties of Metals and Non-Metals24 mins
Pradeep's H.O.T.S. on Metals and Non-metalsPradeep's H.O.T.S. on Metals and Non-metalsPradeep's H.O.T.S. on Metals and Non-metals36 mins
Smart Revision | Formation of CompoundsSmart Revision | Formation of CompoundsSmart Revision | Formation of Compounds47 mins
NCERT | Metallurgy - IINCERT | Metallurgy - IINCERT | Metallurgy - II48 mins
Foundation | MetallurgyFoundation | MetallurgyFoundation | Metallurgy42 mins
Smart Revision | Master Physical Properties of Metals and Non-metalsSmart Revision | Master Physical Properties of Metals and Non-metalsSmart Revision | Master Physical Properties of Metals and Non-metals43 mins
Lakhmir Singh | Metals and Non-MetalsLakhmir Singh | Metals and Non-MetalsLakhmir Singh | Metals and Non-Metals39 mins
Exceptions in Physical Properties of Metals and Non-MetalsExceptions in Physical Properties of Metals and Non-MetalsExceptions in Physical Properties of Metals and Non-Metals32 mins
Goprep Genius Quiz | Chemical Properties of Metals and Non-metals?!Goprep Genius Quiz | Chemical Properties of Metals and Non-metals?!Goprep Genius Quiz | Chemical Properties of Metals and Non-metals?!29 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses