Which reaction yields a salt that has a pH <7?
a) KOH + HBr -> KBr + H₂O
b) H₂SO₄ + Ca(OH)₂ -> CaSO₄ + 2H₂O
c) NH₃ + HNO₃ -> NH₄NO₃
d) HNO₂ -> HNO₃



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