MCQ
The first element of rare–earth metals is
- ✓Cerium
- BActinium
- CUranium
- DLanthanum
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$Pt:\frac{1}{2}\,{H_2}\left( g \right)\,|{H^ + }\left( {{{10}^{ - 8}}\,M} \right)||{H^ + }\,\left( {{{10}^{ - 3}}\,M} \right)|\frac{1}{2}\,{H_2}\left( g \right)\,;Pt$
Reason : The third ionization energy of $Mn$ is larger than that of $Cr$.