) 2Al + 3H2SO4 →" role="presentation" style="display: inline; font-weight: normal; line-height: normal; font-size: 14.6667px; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">→→ Al2(SO4)3 + 3H2 (phản ứng thế)
2) Ba + 2H2O →" role="presentation" style="display: inline; font-weight: normal; line-height: normal; font-size: 14.6667px; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">→→ Ba(OH)2 +H2 (phản ứng thế)
3) SO3 +H2O →" role="presentation" style="display: inline; font-weight: normal; line-height: normal; font-size: 14.6667px; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">→→ H2SO4 (phản ứng hóa hợp)