p-Block elementsHard
Question
Select the correct statement (s) from the following
Options
A.Alcoholic benzidine gives brown colour with H2O2 but not with O3.
B.Lead gives white precipitate with hypo but on boiling with water it turns black.
C.Acidified solution of H2O2 is used for restoring the colour of lead painting.
D.Potassium chlorate with concentrated H2SO4 yields HClO4 and ClO2.
Solution
(A) Alocholic benzidine gives brown colour with only ozone.
(B) S2O32- + Pb2+ → PbS2O3 ↓ (white)
(C) PbS + H2O2 → PbSO4 + 4H2O
lead due to the presence of H2S in atmosphere gets blackened on account of the formation of PbS.
(D) 3KClO3 + 3H2SO4 → 2KHSO4 + HClO4 + 2ClO2 + H2O
(B) S2O32- + Pb2+ → PbS2O3 ↓ (white)
(C) PbS + H2O2 → PbSO4 + 4H2O
lead due to the presence of H2S in atmosphere gets blackened on account of the formation of PbS.
(D) 3KClO3 + 3H2SO4 → 2KHSO4 + HClO4 + 2ClO2 + H2O
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