Question

Take a few zinc granules in a conical flask or test tube.
Add dilute hydrochloric acid or sulphuric acid to this.
Do you observe anything happening around the zinc granules?
Touch the conical flask or test tube. Is there any change in its temperature.

Answer 1

the observation made will be that :

ZN + 2HCL = ZNCL2+ H2

we will be able to see bubbles around the zinc granules due to the hydrogen formed in the reaction.

yes there is a change in the temperature.

Answer 2

Hey dear,

● Answer -
• Effervescence due to H2 gas is observed.
• Temperature of the flask will increase.

● Reaction -
When conc. HCl is added to flask containing Zn granules, zinc chloride is formed.
Zn + 2HCl --> ZnCl2 + H2

Effervescence of H2 gas will be observed in this reaction.
As the reaction is exothermic reaction, temperature of the flask will increase which can be felt by touching.

Thanks for asking..