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All the following substances react with water. The pair that gives the same gaseous product is

1. K and KO2
2. Na and Na2O2
3. Ca and CaH2
4. Ba and BaO2

Correct answer: Ca and CaH2

Solution

Both Ca and CaH2 react with water to produce hydrogen gas (H2). Ca reacts to form Ca(OH)2 and H2, while CaH2 reacts to form Ca(OH)2 and H2 as well.

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