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 :
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- Li and Mg
- Cs and Ba
- Na and Rb
- Na and Ca
The Correct Option is A
Solution and Explanation
Solid hydrogencarbonates: alkali metals other than Li form solid MHCO3 (NaHCO3, CsHCO3, etc.); Li does not. Alkaline earth hydrogencarbonates exist only in solution.
Options (2), (3), (4) each contain Na, Rb or Cs, which form solid hydrogencarbonates and do not form nitrides directly, so they fail.
Li and Mg (diagonal relationship) both form nitrides and neither forms a solid hydrogencarbonate.
Answer: (1) Li and Mg
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