Qaysi moddalarning suvda eritmasini tayyorlab bo‘lmaydi?
a) Al₂(CO₃)₃; b) K₂SO₃; c) C₂H₅ONa; d) CaH₂; e) HCl.

1. a, d
2. a, c, b, e
3. a, c
4. a, c, d