AIIMS 2017 Chemistry Question Paper for free online practice with solutions

The ionisation energies increase with increase in atomic number. However, the trend is irregular among some d-block elements. On the basis of electronic configuration, the
Zn:1s22s2p63s2p6d104s2
Fe:1s22s2p63s2p6d64s2
Cu:1s22s2p63s2p6d104s1
Cr:1s22s2p63s2p6d54s1
IE1 follows the order Zn>Fe>Cu>Cr