$B a C l_{2} (a q) + N a_{2} S O_{4} (a q) \to B a S O_{4} (s) + 2 N a C l (a q)$
The above reaction involves which type of reaction:
a) Displacement
b) Precipitation
c) Combination
d) Double displacement

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(b) & (d)

(a) & (b)

(b) & (c)

(a), (b) & (c)

answer is D.

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Detailed Solution

In the given reaction,
$B a C l_{2} (a q) + N a_{2} S O_{4} (a q) \to B a S O_{4} (s) + 2 N a C l (a q)$

The barium ion displaces the sodium ion and forms barium sulphate and the sodium ion displaces the barium ion and forms sodium chloride. So, the reaction shows a double displacement phenomenon. As the barium sulphate is formed in solid form as a precipitate. So, it is a precipitation reaction too.

A displacement reaction is a chemical reaction in which a more reactive element removes a less reactive element from its aqueous salt solution. This can also be said as a substitution reaction.
When two or more reactants combine to produce a single product, it is called a combination reaction.

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