Correct statement for $3d-$ series is

Among the following metals,the most dense is

Which of the following pairs exhibit color in aqueous medium?

Which of the metal ion will have the highest number of unpaired electrons?

The general electronic configuration of transition elements is.....

Consider $n$ as the number of lone pairs of electrons present in the equatorial position of the most stable structure of $ClF_3$. The ions from the following with $n$ number of unpaired electrons are :
$A. V^{3+}$
$B. Ti^{3+}$
$C. Cu^{2+}$
$D. Ni^{2+}$
$E. Ti^{2+}$
Choose the correct answer from the options given below :