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प्रश्न
Name the following radicals and give their valencies:
1. SO4
2. CO3
3. OH4.
4.Cr2O7
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उत्तर
| Radicals | Valency |
| (i) Sulphate SO4 | 2 |
| (ii) Carbonate CO3 | 2 |
| (iii) Hydroxide OH4 | 1 |
| (iv) Dichromate Cr2O7 | 2 |
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