Stoichiometry
At room temperature, the product [H⁺] [OH⁻] in a solution is 10⁻¹⁴ moles/litre. If, [OH⁻] = 10⁻⁶ moles/litre, then the pH of the solution will be

10
6
8
12

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Stoichiometry
An ideal gas can be liquified, because

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

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