Ground state `He_2` does not exist. An electronic excited state of `He_2`

Monjur Alahi

Ground state `He_2` does not exist. An electronic excited state of `He_2`
A. is more unstable than ground state `He_2`
B. is equally unstable as ground state `He_2`
C. is more stable towards dissociation than ground state `He_2`
D. is less reactive than ground state `He_2` orbital


0 like 0 dislike
1 views
Share with your friends

1 Answers

Salim Ahmed Kawsar

Call

Correct Answer - C
An excited electronic state of `He_2^+` is more stable towards dissociation than ground state `He_2`. This is because excited state must have more bonding than antibonding electrons.

0 like 0 dislike
1 views
Talk Doctor Online in Bissoy App
The bond order in `He_2^(+)` ions is :

Correct Answer - A `He_2^(+)=(sigma_(1s))^2 (sigma_(1s))^1 : BO =1/2 (2-1) =1/2 =0.5`

2 Answers 1 views
In a mixture of `H-He^(+)` gas (`He^(+)` is singly ionized `He` atom), `H` atoms and `He^(+)` ions are excited to their respective first excited state

Correct Answer - A Ratio of kinetic energy `K_(1)/K_(2)=((Z_(1)//n_(1))^(2))/((Z_(2)//n_(2))^(2))` Since `n_(1)=n_(2)=2` & `Z_(1)=1` for `H, Z_(2)=2` for `He^(+) implies K_(1)/K_(2)=1/4`

2 Answers 1 views
Not considering the electronic spin, the degeneracy of the second excited state `(n = 3)` of H atom is 9, while the degeneracy of the second excited s

Correct Answer - A For `H^(-2)` nd excited state is `2p`, thus degeneracy is 3.

2 Answers 1 views
The photon emitted due to electronic transition of `5^(th)` excited state to `2^(nd)` excited state in `Li^(2+)`, is used to excite `He^+` already in

Correct Answer - A (A)For `Li^(2+)`, n=6 to n=3 For H, the similar transition is 2 to 1 For `He^+` , the similar transition is 4 to 2 Energy of `4^(th)`...

2 Answers 1 views
A photon of energy `12.09 eV` is completely absorbed by a hydrogen atom initially in the ground state. The quantum number of excited state is

Correct Answer - C Energy difference in hydrogen atom `= 13.6 - (13.6)/(n^(2)) = 12.09 rArr n^(2) ~~ 9 rArr n = 3`

2 Answers 2 views
When a hydrogen atom is excited from ground state to first excited state then

Correct Answer - D In ground state , kinetic energy `= 13.6 eV`, Potential energy `= -27.2 eV` In first excited state, kinetic energy `= 3.4 eV`, Potential energy `= -...

2 Answers 2 views
A photons was absorbed by a hydrogen atom in its ground state, and the elctron was prompted to the fifth orbit. When the excited atom returuned to its

Correct Answer - D `N= .^(n)C_(2) = .^(5)C_(2) = 10`

2 Answers 1 views
An electron in hydrogen atom first jumps from second excited state to first excited state and then from first excited state to ground state. Let the r

Correct Answer - B `E_(1) = (hc)/(lambda) [(1)/(n_(1)^(2)) - (1)/(n_(2)^(2))]` For second excited state to first excited state `E_(1) = (hc)/(lambda) [1/4 - 1/9] rArr (hc)/(lambda) ((5)/(36))` For first excited state...

2 Answers 1 views
In a hydrogen atom, the electron is in `n^(th)` excited state. It may come down to second excited state by emitting ten different wavelengths. What is

Correct Answer - A `10= .^(n)C_(2) implies n=5`, then 5 orbits are involved upon coming to second excited state so `n^(th)` excited state is `6^(th) [2^(nd), 3^(rd), 4^(th), 5^(th), 6^(th)]`

2 Answers 1 views
An electron collides with a fixed hydrogen atom in its ground state. Hydrogen atom gets excited and the colliding electron loses all its kinetic energ

Correct Answer - C Excitation upto `n=3` is required so that visible length is emitted upon de-excitation. So required energy `=13.6 (1-1/9)=12.1 eV`

2 Answers 1 views
X