Heat oven to 425°F; foil-line 18-by-13-inch rimmed sheet. Toss carrots, chickpeas, and onion with 1 tablespoon oil and 1/4 teaspoon salt; roast 18 minutes.
Pat chops dry; rub with remaining oil, coriander, cumin, garlic powder, pepper, and remaining salt.
Turn vegetables; make 4 spaces for chops directly against foil.
Roast 15 to 20 minutes until thickest chop reaches 145°F and carrots tender, turning chops after 10 minutes.
Rest pork at least 3 minutes. Drizzle lemon juice over vegetables; serve 1 chop with one-quarter carrots and chickpeas per portion.