The spin-only magnetic moment value of the most basic oxide of vanadium among ${\mathrm{V}}_2{\mathrm{O}}_3$, ${\mathrm{V}}_2{\mathrm{O}}_4$ and ${\mathrm{V}}_2{\mathrm{O}}_5$ is____B.M. (Nearest integer)

The number of statement(s) correct from the following for Copper is/are

(A) $\mathrm{Cu}\left(\mathrm{II}\right)$ complexes are always paramagnetic

(B) $\mathrm{Cu}\left(\mathrm{I}\right)$ complexes are generally colourless

(C) $\mathrm{Cu}\left(\mathrm{I}\right)$ is easily oxidized

(D) In Fehling solution, the active reagent has $\mathrm{Cu}\left(\mathrm{I}\right)$

The number of terminal oxygen atoms present in the product $\mathrm{B}$ obtained from the following reaction is

${\mathrm{FeCr}}_2{\mathrm{O}}_4+{\mathrm{Na}}_2{\mathrm{CO}}_3+{\mathrm{O}}_2\to \mathrm{A}+{\mathrm{Fe}}_2{\mathrm{O}}_3+{\mathrm{CO}}_2$

$\mathrm{A}+{\mathrm{H}}^{+}\to \mathrm{B}+{\mathrm{H}}_2\mathrm{O}+{\mathrm{Na}}^{+}$