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The table below lists some acids and bases.

Stong acids Weak acids Weak bases Strong bases
HBr CH3COOH NH3 NaOH
HNO3 HCOOH NH4OH KOH
H2SO4 Ca(OH)2

Which reaction yields a salt that has a pH < 7?

KOH+HBr
HCOOH+KOH
Ca(OH)2+H2SO4
NH3+HNO3