Chemistry
Which of the following is a non-metallic polyatomic cation ?
- nitrate ion
- ammonium ion
- aluminium ion
- chloride ion
Atomic Structure
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Answer
ammonium ion
Reason — A cation is a positively charged ion, and polyatomic means it is made up of more than one atom. Ammonium ion, NH4+, is made up of nitrogen and hydrogen atoms, both of which are non-metals, and it carries a positive charge. Therefore, it is a non-metallic polyatomic cation.
Nitrate ion and chloride ion are negatively charged anions, while aluminium ion is a metallic monoatomic cation.
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