Question
Explain the uses of periscope.
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| S. No. | Compound | Name of the anion | Formula of anion | Valency of anion |
| 1. | H_(2)O | (i) | $O^(2-)$ | (ii) |
| 2. | NaOH | hydroxide | (iii) | 1 |
| 3. | (iv) | carbonate | $CO_{(3)}^{(2-)}$ | 2 |