Complete the following reaction.
(i) `CaCO_(3) overset(Delta)rarr [A]+underset("gas")([B])`
(ii) `[A]+H_(2)O rarr [C]`
(iii) `[C]+[B] rarr CaCO_(3)+H_(2)O`
(iv) `NH_(4)Cl+[C] overset(Delta)rarr underset("gas")([E])+CaCl_(2)+H_(2)O`
(v) `E+H_(2)O+[B]rarr[F]`
(vi) `NaCl+[F]rarr [G]+NH_(4)Cl`
(vii) `[G] overset(Delta)rarr Na_(2)CO_(3)+H_(2)O+[B]`

Explanation

To complete the given reactions step by step, we will analyze each part of the reaction as described in the question.

### Step 1: Heating Calcium Carbonate
**Reaction:**
\[ \text{CaCO}_3 \overset{\Delta}{\rightarrow} [A] + \text{underset{gas}([B])} \]

**Solution:**
When calcium carbonate (CaCO₃) is heated, it decomposes into calcium oxide (CaO) and carbon dioxide (CO₂) gas.
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