Assertion :In hydrogen and hydrogen like species, orbital energy depends only on the quantum number n whereas in multi-electron atom it depends on quantum numbers n and l. Reason: The principal quantum number determines the size and the energy of the orbital.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Hydrogen and hydrogen-like species contains on electron only. Thus the electrostatic interaction is in between the positively charged nucleus (+Ze) and negatively charged electron (-e). Thus energy depends only on the value of principal quantum number n. n also determines the size of the orbital.
Whereas in case of multi-electron atoms, along with attraction between nucleus and electron they also posses electron-electron repulsion within an orbital. And thus the energy depends on both n and l values where l= azimuthal quantum number.
Thus, Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Similar questions

Q. Assertion : Two electrons of helium atom are placed in only one shell but three electrons of lithium need two shells.
Reason: A shell can have maximum

{2n}^{2}

electrons.

ASSERTION: n-Pentane and n-Hexane belong to a homologous series.

REASON: n-Pentane and n-Hexane belong to the same class of hydrocarbons and they differ by a - $C H_{2}$ - group.

Assertion (A) All collision of reactant molecules lead to product formation.

Reason (R) Only those collisions in which molecules have correct orientation and sufficient kinetic energy lead to compound formation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

Q. Assertion : In the bonding molecular orbital (MO) of

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, the electron density is increased between the nuclei.
Reason : The bonding MO is

ψ_{A} + ψ_{B}

, which shows destructive interference of the combining electron waves.

Q. Assertion: The compressibility factor for

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Reason: The compressibility factor for

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