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