MHTCET 10 May 2024 Shift 1 Paper

Concept:Rare earth elements are the 15 lanthanides plus scandium and yttrium.Explanation:Samarium ($\mathrm{Sm}$) belongs to the lanthanide series.Its atomic number is $62$.Hence, $\mathrm{Sm}$ is a rare earth element.Mercury ($\mathrm{Hg}$) is a transition metal.Zinc ($\mathrm{Zn}$) is a transition metal.Tungsten ($\mathrm{W}$) is also a transition metal.Therefore, among the given options, only samarium is a rare earth element.Answer:A. $\mathrm{Sm}$