All the following statements are true about carbon dioxide except:

Its molecular formula is

C O_{2}

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Its molecular mass is 44 u

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Dense than air

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It always exists as gas

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Solution

The correct option is D It always exists as gas
Carbon dioxide has a molecular formula $C O_{2}$ and has a molecular mass of 44 u. It is denser than air, because of which it is used in fire extinguishers.

Although it exist as a gas in the atmosphere, it can be converted into solid by reducing the temperature and increasing the pressure. Solid carbon dioxide is also called dry ice.

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