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| Pregunta | Respuesta |
| What is the formula for a nitrate ion? | NO₃⁻ |
| What is the formula for a carbonate ion? | CO₃²⁻ |
| What is the formula for a sulphate ion? | SO₄²⁻ |
| What is the formula for a hydroxide ion? | OH⁻ |
| What is the formula for an ammonium ion? | NH₄⁺ |
| What is the formula for a zinc ion? | Zn²⁺ |
| What is the formula for a silver ion? | Ag⁺ |
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