How many of the following types of isomerism can be shown by the salt [Co(NH₃)₄(NO₂)Cl]NO₂·H₂O? Linkage, coordination, ionisation, geometrical, hydrate, optical, stereo.

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Linkage: NO₂⁻ can bind through N or O. Ionisation: the inner Cl⁻ can exchange with the outer NO₂⁻. Hydrate: water can move into the coordination sphere. Geometrical: Ma₄bc has cis and trans forms, so stereoisomerism is also shown. Optical: both cis and trans are achiral, so no. Coordination: there is only one complex ion, so no. Count = 5.

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