Rahul took some zinc granules in a test-tube and added dilute $\mathrm{H}\mathrm{C}\mathrm{l}$ to it. He observed that the colour of zinc granules changed to

Four students were asked to study the reaction between aqueous solutions of barium chloride and sodium sulphate. On mixing the solutions of the two salts in a test tube, they reported their experiment as follows:
$\left(\mathrm{i}\right)$ the colour of the mixture becomes brown
$\left(\mathrm{ii}\right)$ the solutions form separate layer
$\left(\mathrm{iii}\right)$ a colourless mixture is obtained
$\left(\mathrm{iv}\right)$ a white substance settles at the bottom

The correct report is