Advertisements
Advertisements
प्रश्न
Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because ____________.
विकल्प
Zinc is lighter than iron
Zinc has lower melting point than iron
Zinc has lower negative electrode potential than iron
Zinc has higher negative electrode potential than iron
Advertisements
उत्तर
Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because Zinc has higher negative electrode potential than iron.
Explanation:
`"E"_("Zn"^(2+)|"Zn")^0` = – 0.76 V and `"E"_("Fe"^(2+)|"Fe")^0` = 0.44 V
Zinc has higher negative electrode potential than iron, iron cannot be coated on zinc.
APPEARS IN
संबंधित प्रश्न
Arrange the following metals in the order in which they displace each other from the solution of their salts.
Al, Cu, Fe, Mg and Zn.
Construct a labelled diagram for the following cell:
`Zn|Zn^(2+)(1M)||H^+(1M)|H_(2(g,1atm))|Pt`
How many electrons flow through a metllic wire if a current of 0·5 A is passed for 2 hours? (Given : 1 F = 96,500 C mol−1)
For the electrochemical cell:
\[\ce{M | M+ || X- | X}\];
\[\ce{E^{\circ}_{{M^{+}/{M}}}}\] = 0.44 V,
\[\ce{E^{\circ}_{X/X^-}}\] = 0.33 V
Which of the following is TRUE for this data?
In the electrochemical cell: Zn|ZnSO4 (0.01 M)||CuSO4 (1.0 M)|Cu, the emf of this Daniel cell is E1. When the concentration of ZnSO4 is changed to 1.0 M and that CuSO4 changed to 0.01 M, the emf changes to E2. From the above, which one is the relationship between E1 and E2?
Which of the following statement is correct?
An electrochemical cell can behave like an electrolytic cell when ______.
For the given cell, \[\ce{Mg | Mg^{2+} || Cu^{2+} | Cu}\]
(i) \[\ce{Mg}\] is cathode
(ii) \[\ce{Cu}\] is cathode
(iii) The cell reaction is \[\ce{Mg^+ Cu^{2+} -> Mg^{2+} + Cu}\]
(iv) \[\ce{Cu}\] is the oxidising agent
The electrochemical cell stops working after some time because
Can we construct an electrochemical cell with two half-cells composed of ZnSO4 solution and zinc electrodes? Explain your answer.
