A student added dilute $\mathit{HCl}$ to a test tube containing zinc granules and made the following observation:

1. Zinc surface becomes dull and black
2. A gas evolved that burnt with a pop sound
3. The solution remained colourless

Which of the observation/s is/are correct?

A student added dilute $\mathit{HCl}$ 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.
$\mathit{Zn}+2\mathit{HCl }\to \mathit{ ZnC}{l}_2+H_2$.

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.