Blue colouration is not produced when :

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(C) Let us analyze each reaction:$1$. $Cr_2O_7^{2-} + H_2O_2 + H^{+} \rightarrow CrO_5 + H_2O$. $CrO_5$ is a deep blue coloured compound.$2$. $NO_2 +

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$Fe^{3+} + SCN^{-} \xrightarrow{}$

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(C) Let us analyze each reaction:$1$. $Cr_2O_7^{2-} + H_2O_2 + H^{+} \rightarrow CrO_5 + H_2O$. $CrO_5$ is a deep blue coloured compound.$2$. $NO_2 + NO \xrightarrow{-23^{\circ}C} N_2O_3$. $N_2O_3$ is a blue solid at low temperatures.$3$. $Fe^{3+} + SCN^{-} \rightarrow [Fe(SCN)]^{2+}$. This complex is blood-red in colour,not blue.$4$. $CuSO_{4(s)} + 5H_2O_{(g)} \rightarrow CuSO_4 \cdot 5H_2O_{(s)}$. Hydrated copper$(II)$ sulfate is blue.Therefore,the reaction that does not produce a blue colour is $Fe^{3+} + SCN^{-} \rightarrow [Fe(SCN)]^{2+}$.

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