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 question, we need to identify two elements, A and B, that have similar chemical properties, do not form solid hydrogencarbonates, and react with nitrogen to form nitrides. Let's break down the solution step by step.

### Step 1: Identify the Groups of Elements
The question hints that elements A and B have similar chemical properties. In the periodic table, elements in the same group often exhibit similar properties. The question suggests that we should consider elements from groups 1 and 2, which are the alkali metals and alkaline earth metals, respectively.

**Hint:** Look for elements in the same group of the periodic table that exhibit similar chemical behavior.

### Step 2: Analyze the Formation of Hydrogencarbonates
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