Two elements A and B have similar chemical properties. They don’t form solid hydrogencarbonates, but react with nitrogen to form nitrides. A and B, respectively, are :

Options

A. Na and Ca
B. Cs and Ba
C. Na and Rb
D. Li and Mg

Explanation

To solve the problem, we need to identify two elements A and B that share similar chemical properties, do not form solid hydrogen carbonates, and react with nitrogen to form nitrides.

### Step-by-Step Solution:

1. **Identify the Elements**: We are looking for two elements that have similar chemical properties. This suggests that they may belong to the same group in the periodic table or have a diagonal relationship.

2. **Analyze the Properties**: The question states that both elements do not form solid hydrogen carbonates. In the periodic table, alkali metals (Group 1) and alkaline earth metals (Group 2) are known for their reactivity and the formation of various compounds. However, lithium (Li) from Group 1 is unique as it forms a liquid hydrogen carbonate instead of a solid.

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