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99 Percentile Qs Bank for JEE MainChemistryd and f Block Elements

Which of the following can produce a colour change from yellowish brown to light green in acidified aqueous solution of Iron (III) chloride?

Options

  1. AH 2 gas
  2. BO 2
  3. CAddition of zinc and HCl
  4. DSimple addition of HCl

Correct answer

C. Addition of zinc and HCl

Step-by-step solution

Z n + 2 H C l → Z n C l 2 + 2 ( H ) F e C l 3 + ( H ) → F e C l 2 + H C l Zinc and HCl produce nascent hydrogen which reduces yellowish brown F e C l 3 to light green F e C l 2 .

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