Neco 2025 Chemistry Question 33

Practice objective / multiple choice question 33 from the 2025 Neco Chemistry examination.

Neco 2025 Chemistry Objective / Multiple Choice Medium Difficulty

Question 33 NECO • 2025 • CHEMISTRY • objective

Potassium chlorate decomposes on heating according to \(2\text{KClO}_3 \rightarrow 2\text{KCl} + 3\text{O}_2\). A 5.00 g sample of KClO_3 is placed in a sealed 2.00 L container at 298 K and allowed to decompose completely. After the reaction the pressure of oxygen measured is 0.45 atm. (a) Calculate the percent yield of oxygen obtained. (b) Determine the mass of potassium chloride formed.

A. (a) 45 % (b) 2.10 g KCl

B. (a) 55 % (b) 2.00 g KCl

Correct Answer C. (a) 60 % (b) 1.83 g KCl

D. (a) 75 % (b) 1.50 g KCl

Correct Answer

Correct Option:

(a) 60 % (b) 1.83 g KCl

This is Neco 2025 Chemistry Question 33. It is one of the objective questions from the 2025 Neco Chemistry examination.

Difficulty level: Medium .

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