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 All the following substances react with water.The pair that gives the same gaseous product is [1994]
  • a)
    K and KO2
  • b)
    Na and Na2O2
  • c)
    Ca and CaH2
  • d)
    Ba and BaO2
Correct answer is option 'C'. Can you explain this answer?
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All the following substances react with water.The pair that gives the ...
The pair which gives the same gaseous product is Ca and CaH2. 

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All the following substances react with water.The pair that gives the ...
Reacting Substances with Water:

- K (Potassium)
- KO2 (Potassium Superoxide)
- Na (Sodium)
- Na2O2 (Sodium Peroxide)
- Ca (Calcium)
- CaH2 (Calcium Hydride)
- Ba (Barium)
- BaO2 (Barium Peroxide)

Gaseous Product:

When these substances react with water, they produce different gaseous products. Let's see the products formed by each substance.

- K + H2O → KOH + H2
- KO2 + H2O → KOH2 + O2
- Na + H2O → NaOH + H2
- Na2O2 + 2H2O → 2NaOH + H2O2
- Ca + 2H2O → Ca(OH)2 + H2
- CaH2 + 2H2O → Ca(OH)2 + 2H2
- Ba + 2H2O → Ba(OH)2 + H2
- BaO2 + 2H2O → 2Ba(OH)2 + O2

Gaseous Product of Same Pair:

We need to find the pair that gives the same gaseous product. As we can see from the above reactions, the only pair that gives the same gaseous product is Ca and CaH2. Both of them produce hydrogen gas (H2) when they react with water.

Therefore, the correct answer is option 'C' - Ca and CaH2.
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