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प्रश्न
What are polyatomic ions? Give examples.
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उत्तर
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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संबंधित प्रश्न
Fill in the following blank with suitable word:
A potassium ion has positive charge because it contains less............... than.....................
A particle P has 18 electrons, 20 neutrons and 19 protons. This particle must be :
The valencies (or charges) of some of the ions are given below :
| Ion | Valency (Charge) | Ion | Valency (Charge) |
| Sodium ion | 1+ | Bromide ion | 1– |
| Ammonium ion | 1+ | Hydroxide ion | 1– |
| Calcium ion | 2+ | Sulphate ion | 2– |
| Lead ion | 2+ | Phosphate ion | 3– |
Using this information, write down the formulae of the following compounds :
(i) Sodium phosphate
(ii) Ammonium sulphate
(iii) Calcium hydroxide
(iv) Lead bromide
Write the basic radicals and acidic radicals of the following and then write the chemical formulae of these compound.
Stannic oxide
Write the basic radicals and acidic radicals of the following and then write the chemical formulae of these compound.
Sodium thiosulphate
Name the following radicals and give their valencies:
1. SO4
2. CO3
3. OH4.
4.Cr2O7
Differentiate between the following with suitable examples- A basic radical and an acid radical
State if the following element or radical is divalent?
Sulphite
State if the following element or radical is divalent?
Chromium
State if the following element or radical is divalent?
Bisulphite
