Zinc and HCl

The video tutorial explains the chemical reaction occurring inside pennies, where hydrogen gas is produced. It also highlights the production of hydrogen chloride gas due to the acid concentration. Although the reaction is not harmful, it is advised to conduct the experiment outdoors for safety reasons.

What type of gas is observed as bubbles inside the pennies?

• Oxygen gas

• Carbon dioxide gas

• Hydrogen gas

• Nitrogen gas

What additional gas is produced due to the concentration of the acid?

• Sulfur dioxide

• Hydrogen chloride

• Ammonia

• Methane

What is the main reason for the production of hydrogen chloride gas?

• The temperature of the environment

• The duration of the experiment

• The concentration of the acid

• The type of metal used

Why is it recommended to perform the experiment outside?

• To avoid staining surfaces

• To prevent fire hazards

• To ensure proper ventilation

• To keep the area clean

Which of the following is NOT a reason for conducting the experiment outside?

• It generates hydrogen chloride gas

• It involves hydrogen gas

• It requires good ventilation

• It produces harmful emissions