Due to the larger size of the tin, it has less nuclear attraction and its electrons move freely. And, hence it has high basicity than oxides of carbon.
As we know, Carbon is a member of group 4A. The outer electronic configuration of group 4A is [He]2s²2p².
Carbon is a non-metal.To complete its octet, carbon requires four electrons which are attained by sharing electrons through a covalent bond. Therefore, carbon dioxide is an acidic oxide.
Tin is also a member of group 4A. The outermost electronic configuration of Sn is [Kr]4d¹⁰5s²5p². Tin is metal and has a larger size, its outer electrons experience less nuclear pull and move freely. Therefore, tin has a higher metallic character and higher basicity. So, it is a basic oxide.
Hence oxides of tin are more basic in water than oxides of carbon.
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