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Elements A & B donot form solid bicarbon...

Elements A & B donot form solid bicarbonae but reacts with `N_2` to give nitrides. which f the following can be A & B?

A

Li,Mg

B

Rb,Na

C

Ca,Cs

D

Ca,Na

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem, we need to analyze the properties of elements A and B based on the given conditions: they do not form solid bicarbonates but react with nitrogen to give nitrides. ### Step-by-Step Solution: 1. **Understanding Bicarbonate Formation**: - Bicarbonates are generally formed by alkali metals and alkaline earth metals. However, the question specifies that elements A and B do not form solid bicarbonates. This suggests that they either do not form bicarbonates at all or form them in a different state (like a solution). 2. **Analyzing Reactivity with Nitrogen**: - The question states that both elements react with nitrogen to form nitrides. Nitrides are compounds formed when elements react with nitrogen, and their stability can vary based on the element's properties. 3. **Identifying Group Trends**: - Elements in Group 1 (alkali metals) and Group 2 (alkaline earth metals) are of interest. Lithium (Li) and magnesium (Mg) are known to have some unique properties compared to their group counterparts. - Lithium reacts with nitrogen to form lithium nitride (Li3N), which is stable due to high lattice energy. - Magnesium also forms a stable nitride (Mg3N2) due to similar reasons. 4. **Considering the Properties of Lithium and Magnesium**: - Lithium does not form a solid bicarbonate; instead, it forms a liquid lithium bicarbonate due to its smaller size and high polarizing power. - Magnesium, due to its diagonal relationship with lithium, exhibits similar behavior and also does not form a solid bicarbonate. 5. **Evaluating the Options**: - The options provided were: 1. Lithium and Magnesium 2. Rubidium and Sodium 3. Calcium and Cesium 4. Calcium and Sodium - Among these, only lithium and magnesium fulfill the criteria of not forming solid bicarbonates while being able to form stable nitrides. ### Conclusion: The correct answer is **Lithium and Magnesium**. ---
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