Which of the following statements is/are not correct?
Zn−Cu cell is called Daniell cell
Rust is Fe2O3
Saline water slows down rusting
Pure metals undergo corrosion faster than impure metals
A
Saline water slows down rusting
B
Rust is Fe2O3
C
Pure metals undergo corrosion faster than impure metals
D
Zn−Cu cell is called Daniell cell
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Solution
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(A)Zn−Cu cell is Daniell cell
oxidation Zn→Zn2++2e−
RednCu2++2e−→Cu
(B)4Fe+3O2+2nH2O⟶2Fe2O3.nH2O
rust
(C) Saline water increase rusting as salt is strong electrolyte and ions present increases the reaction.
(D) Impure metals undergo rusting faster.
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