Solution:
Polarising power of Be+2 and Mg+2 is high. BeCl2. 4H2O and MgCl2 . 6H2O on heating with water undergo hydrolysis and thus undergo chemical change instead of becoming anhydrous.
. 'M' in this reaction can be
Polarising power of Be+2 and Mg+2 is high. BeCl2. 4H2O and MgCl2 . 6H2O on heating with water undergo hydrolysis and thus undergo chemical change instead of becoming anhydrous.