Which $d-$ block element is expected to have highest enthalpy of atomisation, among the following ?
$Sc$
$Mn$
$V$,$Zn$
None of these
Which of the following compounds is metallic and ferromagnetic ?
Which of the following contain $'Sn'$ metal
Consider the following reaction
$\mathrm{MnO}_2+\mathrm{KOH}+\mathrm{O}_2 \rightarrow \mathrm{A}+\mathrm{H}_2 \mathrm{O} .$
Product ' $A$ ' in neutral or acidic medium disproportionate to give products ' $\mathrm{B}$ ' and ' $\mathrm{C}$ ' along with water. The sum of spin-only magnetic moment values of $B$ and $C$ is . . . . . .$BM$. (nearest integer)
(Given atomic number of $\mathrm{Mn}$ is $25$ )
When $Cu^{2+}$ ion is treated with $KI$, a white precipitate is formed. Explain the reaction with the help of chemical equation.
Cuprous ion is colourless, while cupric ion is coloured because