1
Question
A student added dilute HCl to a test tube containing zinc granules. Which of the following observations are correct?
I. Zinc surface became dull and black.
II. A gas was evolved which burnt with a pop sound.
III. The solution remained colourless.
A student added dilute HCl to a test tube containing zinc granules. Which of the following observations are correct?
I. Zinc surface became dull and black.
II. A gas was evolved which burnt with a pop sound.
III. The solution remained colourless.
Open in App
Solution
The correct option is D I, II and III
Zn+2HCl→ZnCl2+H2Due to the reaction of zinc with the acid, zinc loses its shiny appearance. H2 gas is evolved during the reaction. We can identify the gas with a burning match stick. A pop sound indicates its presence.Zinc chloride formed in the reaction is colourless, so, the solution does not change its colour.
Hence, all the statements are correct.
Zn+2HCl→ZnCl2+H2
Due to the reaction of zinc with the acid, zinc loses its shiny appearance.
H2 gas is evolved during the reaction. We can identify the gas with a burning match stick. A pop sound indicates its presence.
Zinc chloride formed in the reaction is colourless, so, the solution does not change its colour.
Hence, all the statements are correct.
Hence, all the statements are correct.
Suggest Corrections
0
