QAIPMT-2008-Ch-2219: NEET 2008 Chemistry - Class 12 AIPMT-2008-Ch-2219 Solution: The sequence of ionic mobility in aqueous solution is \(Rb^+ >…

Ti ; Z (22) is 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 2 V ; Z (23) is 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 3 Cr ; Z (24) is 1s 2 2s 2 2p 6 3s 2 3p 6 3d 5 4s 1 Mn ; Z (25) is 1s 2 2s 2 2p 6 3s 2 3d 5 4s 2 The second electron in all the cases (except Cr) is taken out from 4s-orbital and for Cr it is taken from completely half filled 3d-orbital. The force required for removal of second electron will be more for Mn than others (except for Cr) due to having more positive charge. Based on this we find the correct order Mn > V > Ti. i.e. Cr > Mn > V > Ti.