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
I and II
B
I and III
C
II and III
D
I, II and III

Solution

## The correct option is D I, II and III$$Zn + 2HCl \rightarrow ZnCl_2 + H_2$$Due to the reaction of zinc with the acid, zinc loses its shiny appearance. $$H_2$$ 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.Chemistry

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