Electrochemical Series
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The element A placed above element B in the electrochemical series can displace element B from its salt.
False
True
For the reduction of NO−3 ion in an aqueous solution E∘ is +0.96 V. Values of E∘ for some metal ions are given below:
V2+(aq)+2e−→V;E0=−1.19V
Fe3−(aq)+3e−→Fe;E∘=−0.04V
Au3+(aq)+3e−→Au;E∘=+1.40V
Hg2+(aq)+2e−→Hg;E0=+0.86V
The pair(s) of metals that is/are oxidised by NO−3 in aqueous solution is (are)
- V and Hg
- Hg and Fe
- Fe and Au
- Fe and V
(i)V2+(aq)+2e−→V; E⊖=−1.19V
(ii)Fe3+(aq)+3e−→Fe; E⊖=−0.04V
(iii)Au3+(aq)+3e−→Au; E⊖=+1.40V
(iv)Hg2+(aq)+2e−→Hg; E⊖=+0.86V
The pair(s) of metals that is/are oxidized by NO_{3}^{\ominus } in aqueous solution is/are
(IIT-JEE, 2010)
- (a) Fe and Au
- (b) Hg and Fe
- (c) V and Hg
- (d) Fe and V
Reduction potentials:
Zn2+/Zn= −0.76
Mg2+/Mg= −2.37
Cu2+/Cu= 0.34
Ag+/Ag= 0.8
Sn2+/Sn= 0.16
Zn vessel
Tin vessel
Silver vessel
Magnesium vessel
E0Cr2O2−7/Cr3+=1.33V;E0Cl/Cl−=1.36V
Based on the data given above strongest oxidising agent will be
- Cr3+
- Mn2+
- MnO−4
- Cl−
- Fe
- Cu
- Zn
- Na
E∘Ag+|Ag=0.8 volt and E∘Zn2+|Zn=−0.76 volt
Which of the following is correct?
Which of the following statements about electrochemical series is wrong?
- It does not compare the relative reactivity of metals
- It compares relative strengths of oxidizing agents
- H2 is centrally placed element
- It is the representation of element in order of increasing or decreasing standard electrode reduction potential
The standard reduction potential data at 25∘C is given below.
E∘(Fe3+/Fe2+)=0.77 V;E∘(Fe2+/Fe)=−0.44V;E∘(Cu2+/Cu)=0.34 V;E∘(Cu+/Cu)=+0.52V;E∘(O2(g)+4H++4e−)→2H2O=+1.23V;E∘(O2(g)+2H2O+4e−)→4OH−=+0.40VE∘(Cr3+/Cr)=−0.74 V;E∘(Cr2+/Cr)=+0.91V
Match E∘ of the rebox pair in Column I with the values given in Column II and select the correct answer using the code given below the lists.
Column IColumn IIP.E∘(Fe3+/Fe)1.−0.18VQ.E∘(4H2O⇌4H++4OH−)2.−0.4VR.E∘(Cu2++Cu→2Cu+)3.−0.04VS.E∘(Cr3+/Cr2+)4.−0.83V
P - (2) Q - (3) R - (4) S - (1)
P - (1) Q - (2) R - (3) S - (4)
P - (3) Q - (4) R - (1) S - (2)
P - (4) Q - (1) R - (2) S - (3)