Question

Name the type of equation shown here:
3Pb+2H3PO4 ==> 3H2+Pb3(PO4)2


A.
double replacement
B.
single replacement
C.
combustion
D.
synthesis

Answer 1

Double replacement I think

Answer 2

Answer: B.  single replacement

Explanation:

1. Double displacement reaction is one in which exchange of ions take place.  

Example: $2NaOH(aq)+(NH_4)_2SO_4(aq)\rightarrow 2NH_4OH(aq)+Na_2SO_4(aq)$

2. Single replacement reaction is a chemical reaction in which more reactive element displaces the less reactive element from its salt solution.

Example: $3Pb+2H_3PO_4\rightarrow 3H_2+Pb_3(PO_4)_2$

3. Combustion is a type of chemical reaction in which fuel is reacted with oxygen to form carbon dioxide and water.

Example:  

$C_6H_{12}O_6+O_2 \rightarrow CO_2+H_2O$

4. Synthesis reaction is a chemical reaction in which two reactants are combining to form one product.

Example: $Li_2O+CO_2\rightarrow Li_2CO_3$