Assertion : $H_{2}$ molecule is more stable than $H e - H$ molecule. Reason: The antibonding electron in $H e - H$ molecule decreases the bond order and there by stability.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
As we know,
B.O. $=$ (no. of bonding electron - no. of antibonding electron) $/ 2$
For $H_{2}$ , B.O. $= (2 - 0) / 2 = 1$
For $H e - H$ , B.O. $2 - 1 / 2 = 0.5$
as he-H have less bond order than hydrogen molecule so it is less stable.

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Similar questions

Q. Assertion: The compressibility factor for

H_{2}

and

H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

H_{2}

and

H e

can be derived from Van der Waal's equation.

Q. Assertion : Bond order of

H_{2}^{+} is 0.5.

Reason : Electrons are removed from the antibonding molecular orbital from

H_{2} .

Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

(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

H_{2}

, 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.

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.

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Assertion :H2 molecule is more stable than He−H molecule. Reason: The antibonding electron in He−H molecule decreases the bond order and there by stability.

Assertion : $H_{2}$ molecule is more stable than $H e - H$ molecule. Reason: The antibonding electron in $H e - H$ molecule decreases the bond order and there by stability.