GK
INVENTIONS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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gas.
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A gas at room temperature.
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A liquid which has evaporated.
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Air.
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Detailed explanation-1: -Oxygen is a gas at room temperature. If the normal melting point of a substance is below room temperature, the substance is a liquid at room temperature. Oxygen ( O2 ) is considered a gas at room temperature ( 273K ). It is considered a liquid at 90K and a solid at 54K .
Detailed explanation-2: -At room temperature, oxygen is a gas and water is a liquid because the force of attraction between oxygen molecules is less than the force of attraction between water molecules.
Detailed explanation-3: -Because in O2, oxygen atom are held together by strong multiple nonds (O=O). The collisions between O2 and other reactant molecules do not break these stronger bonds at room temperature. Therefore it is inert at room temperature.
Detailed explanation-4: -Common gases at room temperature include both elements (such as H2 and O2) and compounds (such as CO2 and NH3). Elements that are gases at room temperature are all nonmetals (such as He, Ar, N2, O2, and so on).