Which one of the following chemical substances exists as a gas under ordinary conditions and room temperature?

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Q: 6 (CDS-I/2002)
Which one of the following chemical substances exists as a gas under ordinary conditions and room temperature?

question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,42,64,25,42,28,11

keywords: 

{'chemical substances': [0, 0, 1, 0], 'gas': [9, 1, 9, 27], 'cci4': [0, 0, 1, 0], 'cf4': [0, 0, 1, 0], 'room temperature': [0, 0, 5, 6], 'ordinary conditions': [0, 0, 1, 0]}

The correct answer is option 2, CF4. This is because CF4, also known as carbon tetrafluoride, exists as a gas under ordinary conditions and room temperature.

Let`s look at the other options to understand why they are not correct:

Option 1: Cl4 (tetrachloride) does not exist as a gas under ordinary conditions and room temperature. It exists as a liquid at room temperature.

Option 3: CCl4 (carbon tetrachloride) also does not exist as a gas under ordinary conditions and room temperature. It exists as a liquid at room temperature.

Option 4: CBr4 (carbon tetrabromide) does not exist as a gas under ordinary conditions and room temperature. It exists as a solid at room temperature.

It is important to note that the physical state of a chemical substance can vary depending on the temperature and pressure conditions. In this case, CF4 is the only substance among the options that is a gas under ordinary conditions and room temperature.