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Question

Which amongst the following gases forms a triatomic molecule?

A
Chlorine
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B
Carbon dioxide
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C
Carbon monoxide
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D
Helium
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Solution

The correct option is B Carbon dioxide
Atomicity is defined as the number of atoms in a molecule.
MoleculeSymbolConstituent atomsAtomicityNitrogenN2 2 N2 Carbon dioxideCO21 C, 2 O3Carbon monoxideCO1 C, 1 O 2NeonNe1 Ne 1
Hence, carbon dioxide is a triatomic molecule.

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