Intense blue precipitate of ${Fe}_{4} {[Fe (CN)_{6}]}_{3}$ and potassium hydroxide solution when mixed gives

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$KFe [Fe (CN)_{6}]$ -Turnbull's blue

$Fe {(CN)}_{3}$ -reddish-brown precipitate

$K_{2} Fe [Fe (CN)_{6}]$ -white precipitate

$Fe (OH)_{3}$ - reddish-brown precipitate

answer is B.

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Detailed Solution

Because only ionic chemicals get a positive result on the chromyl chloride test and mercuric chloride is not an ionic compound, ${HgCl}_{2}$ does not. This substance is covalent.

Here, option 3 and 4 are false and only option 1 and 2 are true. Thus, option D is correct.

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