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Question
Assertion :The boiling points of noble gases increases from He to Xe Reason: The interatomic van der Waals attractive forces increase from He to Xe
Assertion :The boiling points of noble gases increases from He to Xe Reason: The interatomic van der Waals attractive forces increase from He to Xe
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Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The size of the atoms increases as you go down the periodic table, as does the number of electrons. Hence, the electron cloud gets bigger, and the polarizability also increases, which will also result in greater Van der Waals/London Dispersion forces.
Therefore,
when looking at the noble gases, the boiling point is predicted to increase as you go down, in the order He, Ne, Ar, Kr, Xe, Rn, and this is indeed the case.
He(−268.9°C),Ne,(−246.1°C),Ar(−185.8°C),Kr(−153.2°C), Xe(−108.1°C),Rn(−61.85°C).
The size of the atoms increases as you go down the periodic table, as does the number of electrons. Hence, the electron cloud gets bigger, and the polarizability also increases, which will also result in greater Van der Waals/London Dispersion forces.
Therefore,
when looking at the noble gases, the boiling point is predicted to increase as you go down, in the order He, Ne, Ar, Kr, Xe, Rn, and this is indeed the case.
He(−268.9°C),Ne,(−246.1°C),Ar(−185.8°C),Kr(−153.2°C), Xe(−108.1°C),Rn(−61.85°C).
He(−268.9°C),Ne,(−246.1°C),Ar(−185.8°C),Kr(−153.2°C), Xe(−108.1°C),Rn(−61.85°C).
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