Stoichiometry
The pH value of a solution is 5.9. If the hydrogen ion concentration is decreased hundred times, the solution will be

Neutral
Of the same acidity
More acidic
Basic

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Stoichiometry
An ideal gas can be liquified, because

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

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