Acute metabolic acidosis: (AI 2002): (A) Has biphasic effect on K+ excretion, (B) Does not effect K + excretion, (C) Decreases urinary K+ excretion, (D) Increase urinary K+ excretion
Answer is C. Ref: Harrison’s 18/e p366
 

When H+ concentration is increased as in acidosis, H+ ions are secreted (preferentially over K+ ions) in exchange of Na+
Thus in acidosis K+ secretion into tubules (excretion) is inhibited