Write down the cations & anions present in:

(a) NH4OH
(b) CaCO
 

Nh4cation and oh anion
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(a) NH4OH
NH4​+ (ammonium ion and it is a cation)

OH-​(anion)


(b)CaCO
There is no such compound!!!

There is no compound that can exist in this form and even if it exists it will be highly unstable. The stablest compound in this form is CaCO3 and

Ca2+ is cation and CO32- is the anion
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I think,
NH4+,OH-
Ca+,CO-
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What are you looking for?