Question

Which of the following statements is/are not correct?

• A. $Zn-Cu$ cell is called Daniell cell
• B. Rust is $F{e}_2{O}_3$
• C. Saline water slows down rusting
• D. Pure metals undergo corrosion faster than impure metals

Answer 1

Answer: (B), (C), (D)

$\left(A\right)$ $Zn-Cu$ cell is Daniell cell

oxidation $Zn\to {Zn}^{2+}+2e^{-}$

${Red}^n$ ${Cu}^{2+}+2e^{-}\to Cu$

$\left(B\right)$ $4Fe+3O_2+2n{H}_{2}O⟶2{Fe}_2{O}_3.n{H}_{2}O$

rust

$\left(C\right)$ Saline water increase rusting as salt is strong electrolyte and ions present increases the reaction.

$\left(D\right)$ Impure metals undergo rusting faster.