Corrosion

Q.

Briefly describe how water reacts with iron powder stating the experimental condition and write the balanced chemical equations.

Q. Corrosion of iron is essentially an electrochemical phenomenon where the cell reactions are

1. $Fe$ is oxidised to $F{e}^{2+}$ and dissolved oxygen in water is reduced to $O^{2-}$
2. $Fe$ is oxidised to $F{e}^{3+}$ and $H_{2}O$ is reduced to $O_2^{2-}$
3. $Fe$ is oxidised to $F{e}^{2+}$ and $H_{2}O$ is reduced to $O_2^{-}$
4. $Fe$ is oxidised to $F{e}^{2+}$ and $H_{2}O$ is reduced to $O_2$

Q.

Complete and balance the following equation:

$\mathrm{Fe}+{\mathrm{O}}_2\stackrel{\mathrm{Moisture}}{\to }\mathrm{\_\_\_\_\_\_}$

Q. The major components of German Silver are:

1. $Zn,NiandAg$
2. $Cu,ZnandNi$
3. $Ge,CuandAg$
4. $Cu,ZnandAg$

Q. Which of the following statements is not correct for anode electrode?

1. Anode has negative polarity
2. Anode acts as a source of electrons
3. Both oxidation and reduction occurs at anode
4. Oxidation reaction occurs at anode