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Both lithium and magnesium display several similar properties due to the diagonal relationship; however, the one which is incorrect is:

1. Both form basic carbonates
2. Both form soluble bicarbonates
3. Both form nitrides
4. Nitrates of both, Li and Mg, yield NO2 and O2 on heating

Correct answer: Both form basic carbonates

Solution

Lithium and magnesium do share some properties, but lithium carbonate is not basic; it is actually a neutral salt, while magnesium carbonate is basic. This distinction makes the statement about both forming basic carbonates incorrect.

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