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Question

Given : EAg|Ag=0.80V,EMg2+|Mg=2.37V; ECu2+|Cu=0.34V.EHg2+|Hg=0.79V

Which of the following statements is/ are incorrect ?


A
AgNO3 can be stored in copper vessel.
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B
Cu(NO3)2 can be stored in magnesium vessel.
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C
CuCl2 can be stored in silver vessel.
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D
HgCl2 can be stored in copper vessel.
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Solution

The correct options are
A AgNO3 can be stored in copper vessel.
B Cu(NO3)2 can be stored in magnesium vessel.
D HgCl2 can be stored in copper vessel.

If Ecell>0, then the reaction is spontaneous.


a. Ecell=0.80.34=0.46V (2Ag+Cu2Ag+Cu2+)


b. Ecell=0.34(2.37)=2.81,V

(Cu2++MgCu+Cu+Mg2+)


c. Ecell=0.340.8=0.46V

(Cu2++2AgCu+2Ag2+)


d. Ecell=0.790.34=0.45V

(Hg2++CuCu2++Hg)


In (a), (b), and (d), Ecell>0 which means that the respective solution in the respective vessel cannot be stored.

Hence correct options are A, B and D.

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