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Hydrogen

Short Answer Type

51.

How is H₂O₂ prepared by auto-oxidation method?

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52. Out of H₂SO₄ and H₃PO₄, which is preferred to prepare H₂O₂?

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53.

Why is 2-anthraquinol preferred in the commercial preparation of H₂O₂?

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54.

Is H₂O₂ a strong acid in aqueous solution?

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55.

Give a test to identify H₂O₂.

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56.

How decomposition of H₂O₂ is accelerated ?

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57.

How decomposition of H₂O₂ is prevented?

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58.

Explain why hydrogen peroxide is used to restore old lead paintings in museums ?

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Long Answer Type

59. Justify the position of hydrogen in the periodic table on the basis of its electronic configuration.

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Short Answer Type

60. Give examples showing electropositive character of hydrogen.

(i) It combines with electronegative elements to form covalent compounds e.g., H₂O, H₂S, HF, NH₃ etc.

(ii) When an aqueous solution of HCl or acidulated water is electrolyzed, hydrogen is liberated at the cathode showing that it is present as H⁺ ions in solution.

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