Question

Dilute hydrochloricacid is added to granulated zinc taken in a rest tube. The following observations are recorded. Point out the correct observations. (i) The surface of metal become shining. (ii) The reaction mixture turn milky. (iii) odour of a pungent smelling gas is recorded (iv) A colourless and odourless gas is evolved​

Answer 1

I think 4th option is correct because when hydrochloric acid is added to zinc , an exothermic reaction takes place along with displacement reaction.

So a gas will evolve and beaker will become a little hot.