Question

What would you observe when dilute hydrochloric acid is added on zinc pieces taken in a test tube. How do you identify the gas evolved. Write one use of this gas.

Answer 1

Zn+Hcl=Zncl+h2

H2 gas can be detect by pop up sound when burning match stick bring top of test tube

Answer 2

When you put dil. HCl in zinc pieces, standard metal acid reaction will occur. There will be formation of zinc chloride and hydrogen gas. One can observe effervescence of hydrogen gas and white zinc chloride on the zinc piece as later is insoluble in water, and act as a protective layer of further reaction.