Question on: JAMB Chemistry - 2009
A
X
B
Y
C
Z
D
R
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Correct Option: C
Here's the breakdown of why curve Z represents the evolution of oxygen:
* **The Reaction:** The equation 2KClO3(s) → 2KCl(s) + 3O2(g) shows the decomposition of potassium chlorate (KClO3) into potassium chloride (KCl) and oxygen gas (O2).
* **Oxygen Production:** Oxygen gas is a product of this reaction. As the reaction proceeds, the amount of oxygen produced increases.
* **Curve Analysis:**
* Curve X and R are starting from an amount of oxygen and decreasing, not increasing.
* Curve Y is constant, meaning no oxygen is being produced.
* Curve Z starts at zero oxygen and increases with time, which matches the oxygen production.
*
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