CBSE Class 10 Answered
Assertion- Silver articles become coated with a black layer upon exposure to air.
Resaon- A layer of oxide gets deposited upon oxidation with air.
A- Assertion and Reason both are correct and reason is the correct explanation of assertion.
B- Assertion and Reason both are correct and reason is not the correct explanation of assertion.
C- Assertion is true but reason is false.
D- Reason is true but assertion is false
Please provide an explanation too.
Asked by vandanawasan02 | 13th Feb, 2020, 09:24: AM
Expert Answer:
Aseertion and reason both are correct and reason is correct explanation of assertion. When silver is exposed to air, it becomes black due to oxide coating, although silver is not very reactive metal but with passage of time, it slowly reacts with oxygen in the air and forms black coloures silver oxide.
Follow up question- Silver forms sulphide layer upon oxidation. I am confused between B and C. A option is definitely wrong.
Asked by vandanawasan02 | 13 Feb, 2020, 02:08: PM
Expert Answer
Silver also forms Silver Sulphide because of reaction in between traces of H2S present in environment. Silver reacts with oxygen and forms Silver Oxide. Silver Sulphide is formed in more quantity as compared to Silver oxide because Silver has more affinity to form a bond with S as compared to O. Ag reacts very slow with O.
So Oxide is deposited but colour of Ag2O is brown in layer and colour of Ag2S is black.
So Silver is oxidised and forms Silver sulphide and Silver oxide. But black colour of layer is formed due to sulphide formation (due to high affinity with silver) which forms when silver is exposed to air.
Answered by Ravi | 13 Feb, 2020, 03:18: PM
Application Videos
Concept Videos
-
Types of Chemical Reactions
Study the meaning of oxidation, reduction and Redox reaction in terms of h... -
Types of Chemical Reactions
Study the meaning of oxidation, reduction and Redox reaction in terms of h... -
Types of Chemical Reactions
Study the meaning of oxidation, reduction and Redox reaction in terms of h...
CBSE 10 - Chemistry
Asked by ten.foundation | 29 Aug, 2022, 07:53: PM
ANSWERED BY EXPERTCBSE 10 - Chemistry
Asked by bhuyanagas | 30 Nov, 2021, 09:46: PM
ANSWERED BY EXPERTCBSE 10 - Chemistry
Asked by s158410a.niraj007031 | 03 Nov, 2021, 05:04: PM
ANSWERED BY EXPERTCBSE 10 - Chemistry
Asked by shlok4559 | 01 Nov, 2021, 09:39: PM
ANSWERED BY EXPERTCBSE 10 - Chemistry
Asked by pardeep360sehlang | 06 Oct, 2021, 09:28: PM
ANSWERED BY EXPERTCBSE 10 - Chemistry
Asked by yogipharma11 | 22 Oct, 2020, 06:28: PM
ANSWERED BY EXPERTCBSE 10 - Chemistry
Asked by nehchalrs15 | 02 Oct, 2020, 10:14: AM
ANSWERED BY EXPERTCBSE 10 - Chemistry
Asked by nirupathak2004 | 21 May, 2020, 06:09: PM
ANSWERED BY EXPERTCBSE 10 - Chemistry
Asked by bhuvaneswari5781 | 18 May, 2020, 11:13: AM
ANSWERED BY EXPERTCBSE 10 - Chemistry
Asked by debjit_dm | 01 May, 2020, 04:41: PM
ANSWERED BY EXPERT
Get in Touch
