Why is HCN an oxyacid and not a Binary Acid

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In my chemistry worksheet HCN is described as an oxyacid, but it isn't polyatomic, nor contains oxygen. Is it an exception to the Oxyacid rule or can CN be technically considered Polyatomic?

May 26th, 2015

HCN is a binary acid, there must be a problem with your workshet, but take into accounbt the following

HCN is binary acid although Contains three elements also contains the polyatomic ion cyanide.

Maybe the problem in the workshet is due to the existence of the following oxyacids:

HOCNCyanic acidOCNCyanate
HNCOIsocyanic acidNCOIsocyanate

May 27th, 2015

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May 26th, 2015
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May 26th, 2015
Jun 28th, 2017
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