Which of the following statements is incorrect?

Which of the following statements is incorrect?
  1. $\mathrm{Fe}^{2+}$ ion also gives blood red colour with $\mathrm{SCN}^{-}$ ion.
  2. $\mathrm{Fe}^{3+}$ ion also gives blood red colour with $\mathrm{SCN}^{-}$ ion.
  3. On passing $\mathrm{H}_{2} \mathrm{~S}$ into $\mathrm{Na}_{2} \mathrm{ZnO}_{2}$ solution a white ppt of $\mathrm{ZnS}$ is formed.
  4. Cupric ion reacts with excess of ammonia solution to give deep blue colour of $\left[\mathrm{Cu}\left(\mathrm{NH}_{3}ight)_{4}ight]^{2+}$ ion.

Solution

Only $\mathrm{Fe}^{3+}$ ions give blood red colouration with $\mathrm{SCN}^{-}$ ions.
$\mathrm{Fe}^{3+}+\mathrm{SCN}^{-} \longrightarrow[\mathrm{Fe}(\mathrm{SCN})]^{2+}$
(dark red) /

Asked in: JEE-TOPICTESTS-CHEMISTRY

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