For the given aqueous reactions, which of the statement (s) is (are) true?

• Correct answer
  A

  The first reaction is a redox reaction.
• B

  White precipitate is $\mathrm{Zn}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{2}$.
• Correct answer
  C

  Addition of filtrate to starch solution gives blue colour.
• Correct answer
  D

  White precipitate is soluble in $\mathrm{NaOH}$ solution.

Solution

(a)
(b)
(c) When the filterate containing $\mathrm{KI}_{3}$ add to start solution, the dissolved $\mathrm{I}_{2}$ will produce a blue colour solution. (d)

Hence, the correct answer is options: 'A', 'C', 'D'.