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When carbonates from the s-block break down, a gas is released that is denser than air and extinguishes a burning splint. Identify the gas.

1. Oxygen (O2)
2. Carbon monoxide (CO)
3. Carbon dioxide (CO2)
4. Tricarbon monoxide (CO3)

Correct answer: Carbon dioxide (CO2)

Solution

When s-block carbonates decompose, they release carbon dioxide, which is denser than air and does not support combustion, thus extinguishing a burning splint.

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