The only oxidation state of cadmium present in 2nd group is :

Q. The only oxidation state of chromium that is present in 3rd group is :

Q. Assertion :All the oxidation states of tin are present in 2nd group. Reason: Salts of tin are more soluble than the salts of silver,that is why silver is in 1st group and tin is in 2nd group.

Q. The oxidation state of manganese present in fourth group is :

Q. The oxidation state of ion of mercury present in second group is :

Q. Elements of group-15 forms compounds in $+5$ oxidation state. However, bismuth forms only one well-characterised compound in $+5$ oxidation state. The compound is: