Hydrated Copper Nitrate Decomposition

The video tutorial demonstrates the thermal decomposition of copper nitrate. Initially, the properties of copper nitrate as a hydrated crystal are discussed. The experiment setup involves placing a small amount of copper nitrate in a boiling tube with cotton wool. The heating process is shown, where the water in the crystal evaporates, leading to a color change from blue to green. As the decomposition progresses, a brown gas, nitrogen dioxide, is released, and the solid turns into black copper oxide. The importance of using a stopper to contain the toxic gas is emphasized.

What is the initial color of hydrated copper nitrate?

• Brown

• Black

• Deep blue

• Green

Why is copper nitrate described as hydrated?

• It is used in thermal decomposition

• It contains copper

• It contains water within its crystal structure

• It is blue in color

What is the purpose of using cotton wool in the experiment?

• To prevent gas escape

• To act as a catalyst

• To change the color of the crystals

• To absorb water

What happens to the copper nitrate crystals when they are initially heated?

• They melt completely

• They release water

• They turn into gas

• They become black

What is observed in the cooler part of the tube during initial heating?

• Condensation of water

• Color change to black

• Release of nitrogen dioxide

• Formation of a solid

What color does the copper nitrate turn into after losing water?

• Deep blue

• Greenish

• Brown

• Black

What gas is formed during the final stage of decomposition?

• Nitrogen dioxide

• Hydrogen

• Oxygen

• Carbon dioxide

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

• Brown

• Black

• Deep blue

• Green

Why is it important to use a stopper during the experiment?

• To change the color of the gas

• To maintain temperature

• To avoid gas escape

• To prevent water loss

What is the nature of the gas formed during the decomposition?

• Odorless

• Toxic

• Non-toxic

• Colorless