A) \[KCNS\]
B) \[HgC{{l}_{2}}\]
C) \[SnC{{l}_{2}}\]
D) \[KI\]
Correct Answer: A
Solution :
Peroxides, if present in old stocks of ethers oxidise\[F{{e}^{2+}}\xrightarrow[{}]{{}}F{{e}^{3+}}\]ions which then combine with KCNS to form blood red colouration due to ferric sulphocyanide. \[F{{e}^{2+}}\xrightarrow[{}]{peroxides}F{{e}^{3+}}\] \[F{{e}^{3+}}+3KCNS\xrightarrow[{}]{{}}Fe{{(CNS)}_{3}}+3{{K}^{+}}\]
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