Question:

Which of the following can't be used as X in the equation given below?
Acid + X Salt + CO2 + Water

Updated On: June 02, 2025
  • Metal hydrogen carbonates
  • Metal carbonates
  • Both (1) and (2)
  • Metal hydroxides
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The Correct Option is C

Solution and Explanation

The given reaction is: \[ \text{Acid} + X \rightarrow \text{Salt} + CO_2 + \text{Water} \] For this reaction, X can be a metal carbonate or a metal hydrogen carbonate, as both of these react with acids to release carbon dioxide, salt, and water. However, metal hydroxides do not release carbon dioxide when they react with acids; instead, they form salt and water. Therefore, metal hydroxides cannot be used as X in this reaction.

The correct option is (C): Both (1) and (2)

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