CBSE BoardEnglish MediumSTD 9ScienceAtoms and Molecules2 Marks
Question
What are polyatomic ions? Give examples.
✓
Answer
A polyatomic ion is a group of atoms carrying a charge (positive or negative). For example, ammonium ion $\big(\text{NH}_{4}^{+}\big),$ hydroxide ion $\big(\text{OH}^-\big),$ carbonate ion $\big(\text{CO}_{3}^{2-}\big),$ sulphate ion $\big(\text{SO}_{4}^{2-}\big).$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.