Mendeleyev investigated the chemical theory of solution.
1. Did Mendeleyev investigate the chemical theory of solution?-общий
2. What did Mendeleyev investigate?- специальный
3. Who investigated the chemical theory of solution?- специальный к подлежащему
4. Mendeleyev investigated the chemical theory of solution, didn*t he?- разделительный
5. Did Mendeleyev or Butlerov investigate the chemical theory of solution?-альтернативный