The spin-only magnetic moment value of $M ^{3+}$ ion (in gaseous state) from the pairs $Cr ^{3+} / Cr ^{2+}$, $Mn ^{3+} / Mn ^{2}, Fe ^{3+} / Fe ^{2+}$ and $Co ^{3+} / Co ^{2+}$ that has negative standard electrode potential, is $B.M...........$ [Nearest integer]
$4$
$2$
$3$
$1$
Which of the following is wrongly matched
$Zn$ and $Hg$ belong to the same group, they differ in many of their properties. The property that is shared by both is
$Cr^{+2}$ has a magnetic moment same as that of
Which alloy contains $Cu, Sn$ and $Zn$
The metal commonly present in brass and german silver is