NCERT Class XI Chemistry Redox Reactions Solutions
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Question : 30
Total: 30
Depict the galvanic cell in which the reaction,
Z n ( s ) + 2 A g ( a q ) + Z n ( a q ) 2 + + 2 A g ( s )
takes place. Further show :
(i) which of the electrode is negatively charged,
(ii) the carriers of current in the cell and
(iii) individual reaction at each electrode.
takes place. Further show :
(i) which of the electrode is negatively charged,
(ii) the carriers of current in the cell and
(iii) individual reaction at each electrode.
Solution:
The given redox reaction is Z n ( s ) + 2 A g ( a q ) + Z n ( a q ) 2 + + 2 A g ( s )
Since Zn gets oxidized toZ n 2 + A g +
Thus, galvanic cell corresponding to the above redox reaction may be depicted as :Z n | Z n ( a q ) 2 + | | A g + ( a q ) | A g
(i) Since oxidation occurs at the zinc electrode, therefore, electrons accumulate on the zinc electrode and hence, zinc electrode is negatively charged.
(ii) The ions carry current. The electrons flow from Zn to Ag electrode while the current flows from Ag to Zn electrode.
(iii) The reactions occurring at the two electrodes are :
At anode :Z n ( s ) Z n ( a q ) 2 + + 2 e –
At cathode :A g ( a q ) + + e – A g ( s )
Since Zn gets oxidized to
Thus, galvanic cell corresponding to the above redox reaction may be depicted as :
(i) Since oxidation occurs at the zinc electrode, therefore, electrons accumulate on the zinc electrode and hence, zinc electrode is negatively charged.
(ii) The ions carry current. The electrons flow from Zn to Ag electrode while the current flows from Ag to Zn electrode.
(iii) The reactions occurring at the two electrodes are :
At anode :
At cathode :
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