Type of chemical reactions

The following is what type of reaction:
PbCl₂ + AgNO₃ → Pb(NO₃)₂ + AgCl

• Synthesis
• Decomposition
• Single Replacement
• Double Replacement

The following is what type of reaction:
NH₃ + HCl  → NH₄Cl

• Synthesis
• Decomposition
• Single Replacement Replacement
• Double Replacement Replacement

What type of chemical reaction is this?
Al(OH)₃ → Al₂O₃  + H₂O

• Decomposition
• Combustion
• Synthesis
• Single Replacement 

Ions in two compounds switch. 

• Synthesis
• Combustion
• Single Replacement
• Double Replacement

3Ca + 2AlCl₃ --> 3CaCl₂ + 2Al

• Synthesis
• Decomposition
• Single Displacement
• Double Displacement

Always starts with a Hydrocarbon that reacts with oxygen and produces carbon dioxide and water. 

• Decomposition
• Synthesis
• Combustion
• Single Replacement

Two Reactants and One Product

• Decomposition
• Synthesis
• Combustion
• Single Replacement

4Si   + S₈   -->   2Si₂S₄

• Synthesis
• Decomposition
• Single Displacement
• Double Displacement

C₄H₁₂ + O₂ → CO₂ + H₂O

• Synthesis
• Combustion
• Single Replacement
• Double Replacement

2Pb(NO₃)₂   -->   2PbO +  4NO₂  +  O₂

• Synthesis
• Decomposition
• Single Displacement
• Combustion