Stoichiometry
In a neutral solution

Both H⁺ and OH⁻ ions are present in very small but equal concentration
OH⁻ ions are absent
H⁺ ions are absent
None of these

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Stoichiometry
An ideal gas can be liquified, because

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

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