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Question
Write the chemical formula of the following compound in a step-by-step manner –
Aluminium hydroxide
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Solution
Write the formula of
| Aluminium hydroxide | Symbol | Valency |
| Aluminium | \[\ce{Al}\] | \[\ce{3^{+}}\] |
| Hydroxide | \[\ce{OH}\] | \[\ce{1^{-}}\] |
Step I – Write each symbol with its valency.
Positive ion is written first
\[\ce{Al}^{3+}\] \[\ce{[OH]}^{1-}\]
Step II – Interchange the valencies positive ion is written first.
The Formula is \[\ce{Al[OH]3}\]
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Match the statements – 1 to 10 below with their correct answers from – A to J.
| Column I | Column II |
| 1. Elements having valency of two. | A: Br1− |
| 2. An anion | B: Divalent |
| 3. A gaseous non-metal | C: Reactants |
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