Question

a student has been collecting silver coins and copper coins after some days when she took out the coin to count object a black counting on Silver coins and green coating on copper coins when a chemical phenomenon is responsible for such accounting write the chemical reaction involved. ​

Answer 1

Answer:

this is the question of chemistry but still i m answering.

Both coins get reacted with air

Ag +H2S = Ag2S + H2

Cu + co2 + H2O = CuCO3.Cu (OH)2

Answer 2

Answer:

Ag + H2S = Ag2S + H2.

Cu + CO2 + H2O = CuCO3.Cu(OH)2.

pls mark as brainliest