The dand fblock elements - Result Question 49

####49. Acidified K2Cr2O7 solution turns green when Na2SO3 is added to it. This is due to the formation of:

(a) Cr2(SO4)3

(b) CrO42−

(c) Cr2(SO3)3

(d) CrSO4

[2011]

Show Answer

Solution:

  1. (a) The green colour appears due to the formation of Cr3+ ion

Cr2O72−+3SO32−+8H+⟶3SO42−+2Cr3++4H2O

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