In the following pairs , each number produces the same gas when reacts

1.	In the following pairs , each number produces the same gas when reacts with water ?
Answer» `K , KO_(2)` `Na, Na_(2)O_(2)` `Ca, CaH_(2)` `BA, BaO_(2)` Solution :Both Ca, `CaH_(2)` react with `H_(2)O` to produce `H_(2)` GAS . `Ca + 2 H_(2) O to Ca(OH)_(2) + H_(2)` `CaH_(2) + 2 H_(2)O to Ca(OH)_(2) + 2H_(2)` In contrast, K reacts with `H_(2)O` to produce `H_(2)` but `KO_(2)` produces `O_(2)` (or `O_(2) + H_(2)O`) , Na produces `H_(2)` but `Na_(2)O_(2)` produces `O_(2)`. Similarly , Ba produces `H_(2)` but `BaO_(2)`produces `O_(2).`

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