Mention the type of compounds formed when small atoms like $H$, $C$ and $N$ get trapped inside the crystal lattice of transition metals. Also give physical and chemical characteristics of these compounds.
The interstitial compounds are formed when small sized atoms such as $\mathrm{H}, \mathrm{B}, \mathrm{C}$ and $\mathrm{N}$ gets trapped in the interstitials of the metal atoms. The properties of interstitial compounds are :
$(i)$ Melting points are high and even higher than pure metals.
$(ii)$ These compounds are extremely hard.
$(iii)$ Metallic conductivity is retained.
$(iv)$ They are chemically inert.
When an acidified solution of ferrous ammonium sulphate it treated with potassium permanganate solution, the ion which is oxidised is
Transition elements show high melting points. Why?
In the following members of transition elements, the lowest ionization energy is of
When $Cu^{2+}$ ion is treated with $KI$, a white precipitate is formed. Explain the reaction with the help of chemical equation.
Why is the ${E^\Theta }$ value for the $Mn ^{3+} / Mn ^{2+}$ couple much more positive than that for $Cr ^{3+} / Cr ^{2+}$ or $Fe ^{3+} / Fe ^{2+} ?$ Explain.