Question

The  chemical  equation
Bacl2  +Na2  So4  →  BaSo4  +  2Nacl  represents  following  type  of  chemical  reaction.
a)  Displacement b)  Combination

c)  Decomposition d)  Double  displacement

Answer 1

DOUBLE DISPLACEMENT is the given reaction this can be explained  by 
AB+CD=AC+BD where precipitate is formed

Answer 2

D) DOUBLE DISPLACEMENT REACTION as in this reaction exchange of irons between the reactants take place.........