Intellectual Olympiad in Soil Science - 2026 ongoing
1000 ₸
Subject: Soil Science Level: IX (I is easiest, XII is hardest)
Category: student
Question language: English
Questions: 15
Example question: A soil solution has a hydrogen ion concentration of 1 × 10⁻⁵ mol L⁻¹. What is its approximate pH? 4, 5, 6, 9