JEE MAIN - Chemistry (2002 - No. 46)
Which of the following ions has the maximum magnetic moment?
Mn2+
Fe2+
Ti2+
Cr2+
Explication
$$M{n^{ + + }} - 5\,\,$$ unpaired electrons
$$F{e^{ + + }} - 4\,\,$$ unpaired electrons
$$T{i^{ + + }}$$$$ - 2\,\,$$ unpaired electrons
$$C{r^{ + + }} - 4\,\,$$ unpaired electrons
hence maximum no. of unpaired electron is present in $$M{n^{ + + }}.$$
NOTE : Magnetic moment $$ \propto $$ number of unpaired electrons
$$F{e^{ + + }} - 4\,\,$$ unpaired electrons
$$T{i^{ + + }}$$$$ - 2\,\,$$ unpaired electrons
$$C{r^{ + + }} - 4\,\,$$ unpaired electrons
hence maximum no. of unpaired electron is present in $$M{n^{ + + }}.$$
NOTE : Magnetic moment $$ \propto $$ number of unpaired electrons