Chemistry-Properties of d-block
NEET Chemistry Properties of d-block MCQ Question
Type: MCQ-numerical-Medium-Class 12
Calculate the number of moles of oxygen gas produced when 31.6 g of potassium permanganate (KMnO4) decomposes at 513 K according to the following reaction: 2KMnO4 → K2MnO4 + MnO2 + O2.
A
0.10 moles
B
0.15 moles
C
0.20 moles
D
0.25 moles
Correct Answer
Option A
Detailed Explanation
The molar mass of KMnO4 is approximately 158 g/mol. 31.6 g corresponds to 0.20 moles of KMnO4. According to the reaction, 2 moles of KMnO4 produce 1 mole of O2. Therefore, 0.20 moles of KMnO4 produce 0.10 moles of O2.
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