Which of the following alloys is used to construct marine condenser tubes of ships?

Which of the following elements has the maximum first ionisation potential?

The electronic configuration of $Pt$ (atomic number $78$) is $...$

$A$ transition metal $X$ has a configuration $[Ar]3d^4$ in its $+3$ oxidation state. Its atomic number is

The element with the highest standard reduction potential (in volt) for the process $M^{2+} \rightarrow M$ among the first row of transition elements is:

Which element from the following does $NOT$ exhibit a magnetic moment in the $+2$ oxidation state?