(B) The reaction of $Fe^{3+}$ with $SCN^{-}$ produces a blood-red complex $[Fe(SCN)]^{2+}$.$Fe^{2+}$ does not form this complex,making statement $B$ i

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$Fe^{2+}$ ion also gives blood red colour with $SCN^{-}$ ion.

(B) The reaction of $Fe^{3+}$ with $SCN^{-}$ produces a blood-red complex $[Fe(SCN)]^{2+}$.$Fe^{2+}$ does not form this complex,making statement $B$ incorrect.$Na_2ZnO_2$ reacts with $H_2S$ to form a white precipitate of $ZnS$.$Cu^{2+}$ reacts with excess $NH_3$ to form the deep blue $[Cu(NH_3)_4]^{2+}$ complex.

Class 12 Chemistry Principles Related to Practical Chemistry Wet Test for Basic Radical

Difficult

Which of the following statements is incorrect?

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A
$Fe^{3+}$ ion also gives blood red colour with $SCN^{-}$ ion.
B
$Fe^{2+}$ ion also gives blood red colour with $SCN^{-}$ ion.
C
On passing $H_2S$ into $Na_2ZnO_2$ solution a white ppt of $ZnS$ is formed.
D
Cupric ion reacts with excess of ammonia solution to give deep blue colour of $[Cu(NH_3)_4]^{2+}$ ion.