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The reaction, BaCl(2)(aq)+K(2)SO(4)(aq)r...

The reaction, `BaCl_(2)(aq)+K_(2)SO_(4)(aq)rarrBaSO_(4)(s)+2KCl(aq)` is a very fast reaction -why?

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The reaction given is an ionic reaction during the reaction no change of oxidation number takes place. Thus the reaction happens very fast.
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CHHAYA PUBLICATION-CHEMICAL KINETICS-WARM UP EXERCISE
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