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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.

Hydrogen (Z=1) has electronic configuration 1s¹. On one hand, its electronic configuration is similar to the outer electronic configuration (ns¹) of alkali metals.

On the other hand, like halogens (having electronic configuration ns²np⁵ belonging to group 17 of the periodic table), it is short by one electron to the corresponding noble gas configuration (ns²np⁶).

Although hydrogen to a certain extent resembles both with alkali metals (Group I) and halogens (Group 17), yet it differs from them as well. Therefore, it is best placed separately in the periodic table.

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Short Answer Type

60. Give examples showing electropositive character of hydrogen.

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