Chemistry (High School) quiz

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Dissolving one mole of each of the oxoacids HNO2, HClO4, H2CO3, and H3PO4 in 2.0 L of distilled water results in solutions with different pH values. Arrange these acid solutions from the one with the highest pH to the one with the lowest pH.
Identify the Brønsted-Lowry conjugate acid-base pair in the following list.
A certain reaction is nonspontaneous under standard conditions, but becomes spontaneous at higher temperatures. What conclusions may be drawn under standard conditions?

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