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Which of the ...

Question

Which of the following cation gives blood red colour with $K C N S$ ?

{N i}^{2 +}

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{F e}^{2 +}

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{F e}^{3 +}

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None of the above

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Solution

The correct option is C ${F e}^{3 +}$
$F e^{3 +}$ gives blood red colour with KCNS

$F e^{3 +} + 3 K C N S \to F e (C N S)_{3} [B l o o d r e d] + 3 K^{+}$

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