LIVE Course for free

Rated by 1 million+ students
Get app now
JEE MAIN 2023
JEE MAIN 2023 TEST SERIES
NEET 2023 TEST SERIES
NEET 2023
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE
0 votes
37.3k views
in Chemistry by (59.0k points)

Give reasons for the following: 

(i) Silver and copper lose their shine when they are exposed to air. Name the substance formed on their surface in each case. 

(ii) Tarnished copper vessels are cleaned with tamarind juice. 

(iii) Aluminium is more reactive than iron yet there is less corrosion of aluminium as compared to iron when both are exposed to air.

1 Answer

+1 vote
by (66.7k points)
selected by
 
Best answer

(i) These metals get corroded. Silver forms black Ag2S (silver sulphide) and copper form greenish layer of basic copper carbonate CuCO3. Cu(OH)2

(ii) Tamarind contains acid which reacts with basic copper carbonate and product gets dissolved and removed from copper vessel. 

(iii) Aluminium forms oxide layer on its surface which does not further react with air.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...