Ozone Depletion Statements Analysis

This question asks to identify the false statement related to ozone depletion over Antarctica. Analyzing the given options:

Key Factors in Antarctic Ozone Depletion

• Option 1: Circumpolar vortex acts as a reaction chamber. This statement is true. The vortex isolates polar air, allowing chemical reactions necessary for ozone depletion to occur efficiently.
• Option 2: Polar Stratospheric Clouds (PSCs) are formed within the vortex. This statement is true. The formation of PSCs requires the extremely low temperatures found inside the isolated polar vortex.
• Option 3: There is very low temperature inside the vortex. This statement is true. Such low temperatures (below -78°C) are essential for PSC formation.

Heterogeneous Reaction Assessment

Option 4: The heterogeneous reaction CIONO$_2$(s)+ HCl(g) $\rightarrow$ Cl$_2$(g)+HNO$_3$(s) takes over PSCs

This statement is identified as the false statement. While heterogeneous chemical reactions occurring on the surfaces of PSCs are critical drivers of ozone depletion, this specific statement is considered incorrect.

The chemical equation represents a known reaction pathway:

$ CIONO_2(s) + HCl(g) \rightarrow Cl_2(g) + HNO_3(s) $

This reaction facilitates the release of ozone-destroying chlorine compounds. However, based on the provided answer key, this statement is designated as false.

Summary

Statements 1, 2, and 3 correctly describe conditions and processes related to Antarctic ozone depletion. Statement 4 is the false statement as indicated.