a . B a O H 2 + Z n S O 4 → B a S O 4 ↓ + Z n O H 2 B a O H 2 + Z n O H 2 → B a Z n O 2 + 2 H 2 O b . C a O H 2 + N a H C O 3 → C a C O 3 ↓ + N a O H + H 2 O c . 2 K 3 P O 4 + 3 C a C l 2 → C a 3 P O 4 2 ↓ + 6 K C l d . H C l + N a A l O 2 + H 2 O → A l O H 3 + N a C l A l O H 3 + 3 H C l → A l C l 3 + 3 H 2 O
→ Đáp án B