Question

please explain which is the correct answer and why it is correct others are not?​

Answer 1

Answer:

(b) Only (ii)

Explanation:

Double displacement are those reactions where there is a mutual exchange of ions of the aq soln of two compn. and new products are formed with interchanged ions and one of the products gets precipitated.

Only in ii reacn exchange of ions is taking place and BaSO4 is getting precipitated.

(i) is a single displacement reacn

(iii) is an addition reaction

and (iv) is a redox reacn