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Question
What are polyatomic ions? Give examples.
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Solution
A polyatomic ion is a group of atoms carrying a positive or negative charge. eg.
| Polyatomic ions | Symbol |
| Ammonium | `NH_4^+` |
| Hydroxide | OH- |
| Nitrate | `NO_3^-` |
| Hydrogen carbonate | `HCO_3^-` |
| Sulphate | `SO_4^(2-)` |
| Sulphite | `SO_3^(2-)` |
| Phosphate | `PO_4^(3-)` |
| Carbonate | `CO_3^(2-)` |
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RELATED QUESTIONS
Write the names of `"CuCo"_3` compounds :
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Write the names of `"HgO"` compounds :
State whether the following statements are true or false :
A chloride ion has negative charge because it has more electrons than a neutral atom.
What is the name of a particle which contains 10 electrons, 11 protons and 12 neutrons ?
Name the particle which has 18 electrons, 18 neutrons and 17 protons in it.
The valencies (or charges) of some of the ions are given below :
Ion Valency Ion Valency (Charge) (Charge)
Sodium ion 1+ Nitrate ion 1–
Copper ion 2+ Sulphide ion 2–
Using this information, write down the formulae of :
- Sodium sulphide
- Copper nitrate
Give example.
Trivalent basic radicals
Write the basic radicals and acidic radicals of the following and then write the chemical formulae of these compound.
Ferrous sulphide
Match the radicals in List I with their correct names from List II.
| List I | List II | |
| 1. `"NO"_3^(1-)` | A: Bisulphite | F: Sulphate |
| 2. `"HSO"_4^(1-)` | B: Phosphate | G: Nitrate |
| 3. `"SO"_4^(2-)` | C: Carbonate | H: Phosphite |
| 4. `"PO"_4^(3-)` | D: Nitrite | I: Sulpite |
| 5. `"HCO"_3^(1-)` | E: Bicarbonate | J: Bisulphate |
