Which of the following substances do not...

Which of the following substances do not exist as a gas at `25^(@)C` and `1 atm`?

`NH_(3)`

`HCl`

`NaCl`

`CH_(4)`

Text Solution

Verified by Experts

The correct Answer is:

Ionic compounds do not exist as gases at `25^(@)C` and `1 atm ` because the cations and anions in an ionic compound are held together by very strong electrostatic forces. To overcome these attractions , we must supply a large amount of energy, thus ,ionic compounds have very high melting and boiling points.
The behaviour of molecular covalent compounds is more varied. Some are gases `(e.g., CO,CO_(2),HCl,NH_(3),and CH_(4))`, but the majority of molecular covalent compouns are liquids or solids under normal conditions.
In general the stronger the intermolecular forces, the less likely a compound can exist as a gas under normal conditions.

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Which of the following species does/do not exist?

`OF_(4)`

`NH_(2)^(-)`

`NCl_(5)`

`IC l_(3)^(+)`

Which of the following species do NOT exist ?

`BeF_(2)`

`BeF_(4)^(2-)`

`BeF_(6)^(3-)`

`BeH_(2)`

Which of the following species does / do not exist ?