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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
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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.
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संबंधित प्रश्न
Assertion: pure iron when heated in dry air is converted with a layer of rust.
Reason: Rust has the compositionFe3O4.
Reduction potential of two metals M1 and M2 are \[\ce{E^0_{{M_1^{2+}|M_1}}}\] = −2.3 V and \[\ce{E^0_{{M_2^{2+}|M_2}}}\] = 0.2 V. Predict which one is better for coating the surface of iron.
Given: \[\ce{E^0_{{Fe^{2+}|Fe}}}\] = −0.44 V
A copper electrode is dipped in 0.1 M copper sulphate solution at 25°C. Calculate the electrode potential of copper.
[Given: \[\ce{E^0_{{Cu^{2+}|Cu}}}\] = 0.34 V]
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If the value of Ksp for Hg2Cl2 (s) is X then the value of X will be ____ where pX = - log X.
Given:
\[\ce{Hg2Cl2 + 2e- -> 2Hg(l) + 2Cl-}\], E° = 0.27 V
\[\ce{Hg+2 + 2e- -> 2Hg(l)}\] E° = 0.81 V
In a solution of CuSO4, how much time will be required to precipitate 2 g copper by 0.5 ampere current?
Galvanic cell is a device in which ______.
Calculate the λ0m for Cl- ion from the data given below:
∧0m MgCl2 = 258.6 Scm2 mol-1 and λ0m Mg2+ = 106 Scm2 mol-1
