The "spin-only" magnetic moment [ in units of Bohrmagneton, $(\mu _B )$ ] of $Ni^{2+}$ in aqueous solution would be (At. No. $Ni= 28)$
$6$
$1.73$
$2.84$
$4.90$
Brass is an alloy of
The metal commonly present in brass and german silver is
The ${E^\Theta }\,\left( {{M^{2 + }}/M} \right)$ value for copper is positive $(+0.34 \,V ) .$ What is possible reason for this? (Hint: consider its high $\Delta_{ a } H^{\theta}$ and low $\Delta_{ hyd } H^{\theta}$ )
The colour of ${(N{H_4})_2}S{O_4}Fe{(S{O_4})_3}.24{H_2}O$ is