Question

All the following act as a Lewis acid in water except: MgO CO2 Fe2+ Ni2+ Please...

All the following act as a Lewis acid in water except:

MgO

CO2

Fe2+

Ni2+

Please explain.

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Answer #1

MgO is a Lewis base and all others are Lewis acid. O2- in MgO act as a lone pair donor when react with water and form Mg(OH)2 and hence is Lewis base just like all metal oxide. All other molecules in the option accept lone pair from water and hence act as a Lewis acid.

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