Predict the sign of entropy change in the following reaction `:`
(i) `O_(2)(g) +2SO_(2)(g) rarr 2SO_(3)(g)`
(ii) `CaC_(2)O_(4)(s) rarr CaCO_(3)(s)+CO(g)`
(iii) `2H_(2)(g) +O_(2)(g) rarr 2H_(2)O(g)`

Explanation

To predict the sign of entropy change (ΔS) for the given reactions, we need to analyze the number of gaseous moles on both sides of the reactions and consider how the randomness of the system changes.

### Step-by-Step Solution:

**(i) Reaction: O₂(g) + 2SO₂(g) → 2SO₃(g)**

1. **Count the moles of gas on each side:**
- Reactants: 1 mole of O₂ + 2 moles of SO₂ = 3 moles of gas
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