Which of the following transitional metal has lowest boiling point (B.P.)

Bell metal is an alloy of

Which of the following statements are correct?

$(A)$ The electronic configuration of $Cr$ is $[ Ar ] 3 d ^{5}$ $4 s^{1}$.

$(B)$ The magnetic quantum number may have a negative value.

$(C)$ In the ground state of an atom, the orbitals are filled in order of their increasing energies.

$(D)$ The total number of nodes are given by $n-2$.

Choose the most appropriate answer from the options given below ....

The metal that shows highest and maximum number of oxidation state is:

Which of the following statements are correct about $\mathrm{Zn}, \mathrm{Cd}$ and $\mathrm{Hg}$ ?

$A$. They exhibit high enthalpy of atomization as the d-subshell is full.

$B$. $\mathrm{Zn}$ and $\mathrm{Cd}$ do not show variable oxidation state while $\mathrm{Hg}$ shows $+\mathrm{I}$ and + $II.$

$C$. Compounds of $\mathrm{Zn}, \mathrm{Cd}$ and $\mathrm{Hg}$ are paramagnetic in nature.

$D$. $\mathrm{Zn}, \mathrm{Cd}$ and $\mathrm{Hg}$ are called soft metals.

Choose the most appropriate from the options given below:

Magnetic moment $2.83\, BM$ is given by which of the following ions ?

(At. nos. $Ti = 22,\,Cr = 24,$ $ Mn = 25,\,Ni = 28$)