List of top Chemistry Questions on Corrosion

Identify the incorrect statement about the corrosion.
In galvanised iron
Tarnishing of silver is due to formation of
The cell formed in bent pipes is an example of
Identify the pair of chlorides responsible for permanent hardness of water.
What is the degree of hardness in ppm of a sample containing \(19\) mg of \(MgCl_2\) \((\text{Molecular Weight}=95)\) in \(2\) kg water sample? Express it in terms of equivalents of \(CaCO_3\).
In the removal of permanent hardness of water by permutit process, \(Na^+\) ions of permutit are exchanged with which ions of water?
The cell formed in bent pipes is an example of
Tarnishing of silver is due to formation of
Number of coulombs corresponding to \(1\text{ mol}\) of electrons approximately is equal to
The amount of silver in mg deposited when \(9.65\) coulombs of electricity is passed through an aqueous solution of silver nitrate is \(\left(Ag=108u,\ 1F=96500\text{ C mol}^{-1}\right)\)
The standard electrode potentials of Zn, Ag and Cu are \(-0.76\), \(+0.80\) and \(+0.34\text{ V}\) respectively. Identify the correct statement from the following.
The cell formed in bent pipes is an example of
Tarnishing of silver is due to formation of
Number of coulombs corresponding to \(1\text{ mol}\) of electrons approximately is equal to
The amount of silver in mg deposited when \(9.65\) coulombs of electricity is passed through an aqueous solution of silver nitrate is \(\left(Ag=108u,\ 1F=96500\text{ C mol}^{-1}\right)\)
The standard electrode potentials of Zn, Ag and Cu are \(-0.76\), \(+0.80\) and \(+0.34\text{ V}\) respectively. Identify the correct statement from the following.
Using \( E^\circ \) values of X and Y given below, predict which is better for coating the surface of iron to prevent corrosion and why?

Given:
\( E^\circ_{X^{2+}/X} = -2.36 \, \text{V} \)
\( E^\circ_{Y^{2+}/Y} = -0.14 \, \text{V} \)
\( E^\circ_{Fe^{2+}/Fe} = -0.44 \, \text{V} \)
From the following select the one which is not an example of corrosion.