JEE Main · 2023 · 31 Jan 2023 · Shift 1 · d and f Block Elements

${\mathrm{MnO}}_4^{2-}$, in acidic medium, disproportionates to :

Consider the following reactions:
$\mathrm{NaCl}+{\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7+{\mathrm{H}}_2{\mathrm{SO}}_4\to \mathrm{A}+{\mathrm{KHSO}}_4+{\mathrm{NaHSO}}_4+{\mathrm{H}}_2\mathrm{O}$ …

Given below are some of the statements about Mn and ${\mathrm{Mn}}_2{\mathrm{O}}_7$. Identify the correct statements
A. Mn forms the oxide ${\mathrm{Mn}}_2{\mathrm{O}}_7$ in which Mn is in its highest oxidation state.
B. Oxygen stabilizes the Mn in higher oxidation states by fo …

On heating a mixture of common salt and ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ in equal amount along with concentrated ${\mathrm{H}}_2{\mathrm{SO}}_4$ in a test tube, a gas is evolved. Formula of the gas evolved and oxidation state of the central metal atom in the gas r …

Among the following oxides of 3d elements, the number of mixed oxides are _____. …

The oxidation state of chromium in the final product formed in the reaction between KI and acidified ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ solution is: