Which of the following statements is incorrect ? - Vidyadip

MCQ

Which of the following statements is incorrect ?

✓
$Fe^{3+}$ 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

✓

Answer

Correct option: A.

$Fe^{3+}$ ion also gives blood red colour with $SCN^-$ ion.

a
Only $Fe^{3+}$ ion gives blood red colouration with $SCN^-$ ion.

$F{e^{3 + }} + SC{N^ - }\, \to \,\mathop {{{[Fe(SCN)]}^{2 + }}}\limits_{{\text{(dark red)}}} $

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