The user wants me to solve a multi-step reaction problem involving Xenon compounds and identify the number of gaseous products in the final step.

Step-by-step Solution:

1. Analyze the first step of the reaction: The reaction starts with Xenon hexafluoride ($XeF_6$) reacting with one equivalent of water ($H_2O$). This is a partial hydrolysis reaction. $XeF_6 + H_2O \rightarrow XeOF_4 + 2HF$ The product 'P' is Xenon oxytetrafluoride ($XeOF_4$). Under ambient conditions, $XeOF_4$ is a liquid (b.p. 41°C) and hydrogen fluoride ($HF$) is a gas (b.p. 19.5°C).

2. Analyze the second step of the reaction: The product 'P' ($XeOF_4$) reacts with two equivalents of water ($H_2O$). This is a further hydrolysis reaction. $XeOF_4 + 2H_2O \rightarrow XeO_3 + 4HF$ This reaction results in the formation of Xenon trioxide ($XeO_3$) and hydrogen fluoride ($HF$). The product 'Q' is Xenon trioxide ($XeO_3$). $XeO_3$ is a solid under ambient conditions.

3. Analyze the final step of the reaction: The final step involves the decomposition of 'Q' ($XeO_3$) upon heating (indicated by the delta symbol, $Δ$). $XeO_3$ is an unstable and explosive solid that decomposes into Xenon gas and Oxygen gas. $2XeO_3(s) \xrightarrow{\Delta} 2Xe(g) + 3O_2(g)$

4. Identify the gaseous products in the final step: The question asks for the total number of gases released as products in the final step. The final step is the decomposition of $XeO_3$. The products of this step are:

   • Xenon ($Xe$): This is a noble gas and exists as a gas under ambient conditions.
   • Oxygen ($O_2$): This is also a gas under ambient conditions.

   Therefore, there are two distinct chemical species that are gases released in the final step.

5. Conclusion: The total number of gases released as products in the final step is 2. This corresponds to option C.