$4.$ True or False: Phosphoric acid can be produced from phosphate rock without generating any form of waste byproduct.

$5.$ True or False: The global distribution of phosphate rock reserves is evenly spread across all continents, ensuring equal access to phosphorus fertilizers worldwide.

$6.$ True or False: The presence of sulfur in ammonium sulfate fertilizer can help lower soil pH over time.

$7.$ True or False: Potassium chloride $($KCl$)$ is the preferred source of potassium for all types of crops, regardless of their chloride sensitivity$.$