Which of the following property of magnesium does not resemble with lithium?

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Lithium (an alkali metal) and magnesium (an alkaline earth metal) exhibit a diagonal relationship due to similar charge/radius ratios.

A. Bicarbonates of both Li and Mg exist in solution but decompose to form carbonates upon evaporation, hence not stable in solid form. This is a resemblance.

B. Carbonates of both Li and Mg decompose on heating to produce CO₂. For example, $L i_{2} C O_{3} \to L i_{2} O + C O_{2}$ and $M g C O_{3} \to M g O + C O_{2}$ . This is a resemblance.

C. Both Li and Mg react with N₂ to form nitrides: $6 L i + N_{2} \to 2 L i_{3} N$ and $3 M g + N_{2} \to M g_{3} N_{2}$ . This is a resemblance.

D. Lithium compounds impart a crimson red color to the flame. Magnesium compounds, however, do not impart any color to the flame because the energy required to excite the electrons is too high, and the emitted light is not in the visible region. Therefore, this property does not resemble.

The final answer is D

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