Acidic Gases and Ferrous Sulfate

The video tutorial explains the concept of thermal decomposition using ferrous sulfate. It demonstrates the process of heating ferrous sulfate, observing color changes from green to white, and then to brown as it decomposes into ferric oxide. The video also highlights the evolution of harmful gases, sulfur dioxide and sulfur trioxide, and tests their acidic nature using litmus paper and potassium permanganate. The tutorial concludes with a summary of the thermal decomposition reaction.

What is the primary requirement for a thermal decomposition reaction?

• Presence of light

• Application of heat

• Addition of water

• Use of electricity

What color does ferrous sulfate turn into when it is initially heated?

• Red

• White

• Blue

• Brown

What is the final color of the compound after complete decomposition?

• Green

• White

• Black

• Brown

Which gases are released during the decomposition of ferrous sulfate?

• Sulfur dioxide and sulfur trioxide

• Carbon dioxide and oxygen

• Nitrogen and hydrogen

• Methane and ethane

How can the presence of acidic gases be confirmed using litmus paper?

• Red litmus turns blue

• Blue litmus turns red

• Green litmus turns yellow

• Yellow litmus turns green

What is the effect of acidic gases on potassium permanganate?

• It turns the solution blue

• It decolorizes the purple color

• It has no effect

• It makes the solution more purple

What is the chemical formula for the brown compound formed after heating ferrous sulfate?

• FeSO4

• Fe2O3

• FeO

• Fe3O4

What is the role of potassium permanganate in the experiment?

• It acts as a catalyst

• It confirms the presence of acidic gases

• It absorbs the gases

• It changes the color of the compound