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Hydrogen

Short Answer Type

41.

What is demineralised water? How is it obtained?

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42.

How is heavy water produced from ordinary water?

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43.

Explain why electrolysis of ordinary water occurs faster than heavy water.

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44.

Give two advantages of using hydrogen as a fuel over gasoline.

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45.

What is the starting material for the manufacture of H₂O₂ by electrolysis by a most modern method?

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46.
How do we prepare H₂O₂ by reaction between BaO₂.8H₂O and dilute sulphuric acid ?

By the action of sulphuric acid on hydrated barium peroxide BaO₂.8H₂O

BaO₂.8H₂O + H₂SO₄ → BaSO₄ ↓+ H₂O₂ + 8H₂O

It must be noted that anhydrous barium peroxide does not react readily with sulphuric acid (because a coating of insoluble barium sulphate is formed on its surface which stops the further action of the acid). Therefore, hydrated barium peroxide, BaO₂.8H₂O must be used.