The atomicity of $K_{2} {Cr}_{2} O_{7}$ is ___.

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answer is B.

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Detailed Solution

Atomicity is the number of atoms present in the molecule.

$K_{2} {Cr}_{2} O_{7}$ has two atoms of potassium, two atoms of Cr, and seven atoms of oxygen. Therefore $K_{2} {Cr}_{2} O_{7}$ has an atomicity of 11.

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