How many of the following metal ions have similar value of spin only magnetic moment in gaseous state? ______________

(Given : Atomic number V, 23; Cr, 24; Fe, 26; Ni, 28)

V$^{3+}$, Cr$^{3+}$, Fe, Ni

The spin-only magnetic moment value of the compound with strongest oxidizing ability among $\mathrm{MnF}_{4}, \mathrm{MnF}_{3}$ and is ____________ B.M. [nearest integer]

The difference in the 'spin-only' magnetic moment values of $\mathrm{KMnO}_4$ and the manganese product formed during titration of $\mathrm{KMnO}_4$ against oxalic acid in acidic medium is ________ . (nearest integer)

Total number of ions from the following with noble gas configuration is _________.

$\mathrm{Sr}^{2+}(z=38), \mathrm{Cs}^{+}(z=55), \mathrm{La}^{2+}(z=57), \mathrm{Pb}^{2+}(z=82), \mathrm{Yb}^{2+}(z=70)$ and

The number of electrons involved in the reduction of permanganate to manganese dioxide in acidic medium is _____________.

Consider the following reaction

$\mathrm{MnO}_2+\mathrm{KOH}+\mathrm{O}_2 \rightarrow \mathrm{A}+\mathrm{H}_2 \mathrm{O} \text {. }$

Among following compounds, the number of those present in copper matte is ___________.

A. $\mathrm{CuCO_{3}}$

B. $\mathrm{Cu_{2}S}$

The difference in oxidation state of chromium in chromate and dichromate salts is ___________.

Manganese (VI) has ability to disproportionate in acidic solution. The difference in oxidation states of two ions it forms in acidic solution is ____________.

The spin-only magnetic moment value of the most basic oxide of vanadium among V₂O₃, V₂O₄ and V₂O₅ is _____________ B.M. (Nearest integer)

The number of statements correct from the following for Copper (at. no. 29) is/are ____________.

(A) Cu(II) complexes are always paramagnetic.

(B) Cu(I) complexes are generally colourless

(C) Cu(I) is easily oxidized

(D) In Fehling solution, the active reagent has Cu(I)