SATHEE: D-And F-Block Elements Ques 182

D-And F-Block Elements Ques 182

Question: A blue colouration is not obtained when

[CBSE PMT 1989]

Options:

A) Ammonium hydroxide dissolves in copper sulphate

B) Copper sulphate solution reacts with $K_{4} [F e {(C N)}_{6}]$

C) Ferric chloride reacts with sodium ferrocyanide

D) Anhydrous $C u S O_{4}$ is dissolved in water

Show Answer

Answer:

Correct Answer: B

Solution:

$C u S O_{4} + K_{4} [F e {(C N)}_{6}] \to$ no reaction

$4 N H_{4} O H + C u S O_{4} \to \underset{D e e p, b l u e}{[C u {(N H_{3})}_{4}]} S O_{4} + 4 H_{2} O$

$\underset{A n h y d r o u s}{C u S O_{4}}, + 5 H_{2} O \to \underset{B l u e}{C u S O_{4}}, .5 H_{2} O$

$4 F e C l_{3} + 3 N a_{4} [F e {(C N)}_{6}] \to \underset{\begin{matrix} F e r r i c, f e r r o c y a n i d e \\ , (Prussian, blue) \end{matrix}}{F e_{4} [F e {(C N)}_{6}]}, + 12 N a C l$

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D-And F-Block Elements Ques 182

Question: A blue colouration is not obtained when

Options:

Answer:

Solution:

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