Question

Which gas is liberated when dilute hydrochloric acid reacts with zinc metal? Write a balanced chemical equation for the reaction which takes place. How will you test this gas? Name a metal which produces the same gas just by reacting with cold water.

Answer 1

Answer:

dil.Hydrochloric acid + zinc metal⇒zinc chloride + hydrogen gas

HYDROGEN GAS is liberated.

For testing- pass through the soap solution,and burst the bubbles it will give POP sound.

balanced chemical equation-

2HCl + Zn ⇒ ZnCl₂ + H₂

Another metal is sodium.

Answer 2

Hydrogen is liberated. $Zn+2HCl\rightarrow ZnCl_2+H_2$. It burns with a pop sound when candle is brought near it. Lithium produces the same gas just by reacting with cold water.

Explanation:

Single replacement reaction is a chemical reaction in which more reactive element displaces the less reactive element from its salt solution.

$Zn+2HCl\rightarrow ZnCl_2+H_2$

Thus zinc when dropped into an aqueous solution of HCl releases hydrogen gas by replacing hydrogen from its position.

Hydrogen burns with a pop sound when a burning candle is brought near it.

A metal such as Lithium which is more reactive than zinc will liberate hydrogen just by reacting with cold water.

Learn more about single replacement

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