MCQ
The most common lanthanide is
- ALanthanum
- ✓Cerium
- CSamarium
- DPlutonium
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(en-ethylenediamine; $H _{2} N - CH _{2}- CH _{2}- NH _{2}$ )
${H_{2(g)}} + {I_{2(g)}}$ $\rightleftharpoons$ $2H{I_{(g)}}$

$I. n = 4,l = 2,m_l = -2, m_s = -1/ 2$
$II. n = 3,l = 2, m_l = 1,m_s = +1/ 2$
$III. n = 4,l = 1, m_l = 0, m_s = +1/ 2$
$IV. n = 3,l = 1, m_l = 1; m_s = -1/ 2$
The correct order of their increasing energies will be