Question

When a student added zinc granules to diluted HCL, a colourless and odourless gas was evolved, which is was then tested with a burning match stick (a) what would be observed?

Answer 1

When Zinc is added to HCl, Hydrogen gas is liberated.

When a burning matchstick is brought near it, it will burn with a pop sound.

Answer 2

Answer: a) A pop sound

Explanation: When Zinc is treated with dilute HCl, zinc being more reactive than hydrogen displaces hydrogen from its salt solution and thus produce zinc chloride and hydrogen gas.

$Zn+2HCl\rightarrow ZnCl_2+H_2$

This is a single replacement reaction as more reactive zinc displaces hydrogen. the hydrogen gas is odorless and colorless and burns with a pop sound when a burning match stick is brought near it.