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Name the gas that turns moist starch iod...

Name the gas that turns moist starch iodide paper blue black.

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**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks for the name of the gas that turns moist starch iodide paper blue-black. 2. **Identifying the Components**: Moist starch iodide paper contains iodide ions (I⁻). 3. **Chemical Reaction**: When chlorine gas (Cl₂) comes into contact with the iodide ions, it undergoes an oxidation reaction. Chlorine gas oxidizes the iodide ions (I⁻) to iodine (I₂). ...
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