AIPMT PRELIMS2009Chemistry-Chemical Bonding
AIPMT PRELIMS 2009 Chemistry Molecular Energies MCQ Question
Type: MCQ-numerical-Medium-Class 11
The energy absorbed by each molecule (A₂) of a substance is 4.4 × 10⁻¹⁹ J and bond energy per molecule is 4.0 × 10⁻¹⁹ J. The kinetic energy of the molecule per atom will be:
A
2.2 × 10⁻¹⁹ J
B
2.0 × 10⁻¹⁹ J
C
4.0 × 10⁻²⁰ J
D
2.0 × 10⁻²⁰ J
Correct Answer
Option D
Detailed Explanation
The kinetic energy per atom is calculated by subtracting the bond energy from the absorbed energy and dividing by 2 (since there are two atoms in a molecule). This gives (4.4 × 10⁻¹⁹ - 4.0 × 10⁻¹⁹) / 2 = 2.0 × 10⁻²⁰ J.
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