The P Block Elements - Result Question 55

####56. Which would quickly absorb oxygen?

[1991, 92]

(a) Alkaline solution of pyrogallol

(b) Conc. H2SO4

(c) Lime water

(d) Alkaline solution of CuSO4

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Solution:

  1. (a) Upon oxidation, pyrogallol forms hydroxyquinone and many other higher molecular mass products.

Hydroxy groups are strong activators of aromatic systems, hence pyrogallol is reactive enough to react with oxygen in air.

57 .

(c) Oleum is H2S2O7(H2SO4+SO3) which is obtained by dissolving SO3 in H2SO4 and is called fuming sulphuric acid.



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