Which of the following statements about plaster mixtures is correct?

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Quick spatulation shortens the setting durationPotassium sulfate at 2% concentration acts as an acceleratorCitrate compounds function as retardersAll the above statements are true

Explanation

Rapid spatulation decreases the setting time of plaster. Adding 2% potassium sulfate serves as an accelerator, speeding up the setting process. Citrates act as retarders, slowing down the setting time. Therefore, all the listed statements are accurate.