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8.3. Organic chemistry purification and characterization — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry8.3. Organic chemistry purification and characterization1 Mark
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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