A student added dilute $HCl$ to a test tube containing zinc granules and made the following observation:
Zinc surface becomes dull and black
A gas evolved that burnt with a pop sound
The solution remained colourless
Which of the observation/s is/are correct?

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1 and 3

1, 2 and 3

1 and 2

2 and 3

answer is D.

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Detailed Solution

A student added dilute $HCl$ to a test tube containing zinc granules and made the zinc surface become dull and black, a gas which evolved and burnt with a pop sound, and the solution remained colourless.
$Zn + 2 HCl \to ZnC l_{2} + H_{2}$ .

Zinc loses its shine as a result of the acid's reaction with it.
The reaction results in the evolution of H₂. With the aid of a burning matchstick, we can detect the gas. Its existence is signaled by a pop sound. Since, the reaction produces colourless zinc chloride, the solution does not change colour.

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