In making gun-barrel,the steel used is

$X + H^{+} \rightarrow Y + Na^{+} + H_2O$
$Y + KCl \rightarrow K_2Cr_2O_7 + NaCl$
Identify $X$ and $Y$ in the given reactions.

Describe the oxidising action of potassium dichromate and write the ionic equations for its reaction with:
$(i)$ iodide
$(ii)$ iron $(II)$ solution and
$(iii)$ $H_{2}S$

Write about the oxides and oxoanions of transition metals.

$NaCl$ reacts with conc. $H_2SO_4$ and $K_2Cr_2O_7$ to give reddish fumes $(B)$,which react with $NaOH$ to give yellow solution $(C)$. $(B)$ and $(C)$ respectively are:

Stainless steel is non-corrosive. This character is more prominent in