Stoichiometry
An ideal gas can be liquified, because

It gets solidified directly without becoming liquid
Its critical temperature is more than 0°C
Its molecular size is very small
Forces operative between its molecules are negligible

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Stoichiometry
Heat of neutralisation of a strong acid and strong base is always a constant value, i.e., 57 KJ/Kg mole. This is because

The strong base and strong acid reacts in aqueous solution
The strong base and strong acid reacts completely
The salt formed does not hydrolyse
Only OH⁻ and H⁺ ions react in every case

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