KCET2020ChemistryElectrochemistry
In which of the following cases a chemical reaction is possible?
Options
- AZnSO ₄(a q) is placed in a copper vessel
- BAgNO ₃ solution is stirred with a copper spoon
- CConc. HNO ₃ is stored in a platinum vessel
- Dgold ornaments are washed with dil. HCl
Correct answer
B. AgNO ₃ solution is stirred with a copper spoon
Step-by-step solution
A chemical reaction is possible when AgNO ₃ solution is stirred with copper spoon as copper has lesser positive value of standard electrode reduction potential as compared to Ag. The reaction will be, 2 AgNO ₃+ Cu Cu ( NO ₃ )₂+2 Ag