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According to one of the most widely acce...

According to one of the most widely accepted theories, carth's atmosphere before origin of life was

A

oxidizing

B

oxidizing along with H,

C

reducing with `O_(2)`, in small amount

D

reducing with oxygen absent in `O_(2)`, from

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The correct Answer is:
D
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According to molecular orbital theory, atomic orbitals of nearly same energy of different atoms are combined and form molecule. In homodiatomic molecule two atomic orbitals which have wave function psi_(A) and psi_(B) are combined in two ways (psi_(A)pm psi_(B)) . They have two type of electron density, one is bonding [(psi_(A) pm psi_(B))^(2)] where e- density increase between nucleus. Another is antibonding [(psi_(A)pm psi_(B))^(2)] where e^(-) density decreases between nucleus. These molecular orbitals are filled according to Hund, Pauli, afbau principle. Existence of molecule depends on bond order. where bond order = ("Number of bonding "e^(-)"s- number of antibonding "e^(-)s)/(2) lf the molecule have unpaired electron it is paramagnetic otherwise diamagnetic Statement- 1: Removal of two e^(-) from N^(2) , magnetic behaviour does not change while addition of two electrons in O_(2) magnetic behaviour changes. Statement-2: In N_(2) removal of electron talces place from bonding orbital while addition of e^(-) in O_(2) is in antibonding orbital

According to molecular orbital theory, atomic orbitals of nearly same energy of different atoms are combined and form molecule. In homodiatomic molecule two atomic orbitals which have wave function psi_(A) and psi_(B) are combined in two ways (psi_(A)pm psi_(B)) . They have two type of electron density, one is bonding [(psi_(A) pm psi_(B))^(2)] where e- density increase between nucleus. Another is antibonding [(psi_(A)pm psi_(B))^(2)] where e^(-) density decreases between nucleus. These molecular orbitals are filled according to Hund, Pauli, afbau principle. Existence of molecule depends on bond order. where bond order = ("Number of bonding "e^(-)"s- number of antibonding "e^(-)s)/(2) lf the molecule have unpaired electron it is paramagnetic otherwise diamagnetic Statement- 1: Removal of two e^(-) from N^(2) , magnetic behaviour does not change while addition of two electrons in O_(2) magnetic behaviour changes. Which of the following correct trends of bond energy is possible to explain by following statement. "Successive filling of antibonding orbital reduce the bond energy between two atoms"? (I ) N_(2) gtgt O_(2) gtgtF_(2) (II) O_(2)^(+) gt O_(2) gt O_(2)^(-) (III) C_(2)^(2) gt C_(2) (IV) CI_(2) gt Br_(2) gt F_(2)

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AAKASH SERIES-EVOLUTION-EXERCISE - III( PREVIOUS AIPMT/NEET QUESTIONS)
  1. According to one of the most widely accepted theories, carth's atmosph...

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  2. Artifical selection to obtain cows yielding higher milk output repres...

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  3. Which of the following represents order of horse ?

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  4. Analogous structure are a result of (2016 - 1)

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  5. Which of the folloiwng structures is homologus to the wing of a bi...

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  6. Following are the two statements regarding the origin of life . Th...

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  7. Select the wrong statement :

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  8. The wings of a bird and the wings of an insect are

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  9. Industrial melansim in an example of :

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  10. Which of the following has the smallest brain capacity ?

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  11. Which one of the following in analogous structures ?

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  12. Forelimbs of cat , Lizard used in walking , fore limbs of whale used ...

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  13. According to Darwin , the organic evolution is due to.

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  14. Variations in gene frequecies within populations can occur by chance ...

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  15. The process by which organisms with different evolutionary history evo...

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  16. The eye of octopus and eye of cat show different patterns of of stru...

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  17. The extinct human who lived 1,00,000 to 40,000 years ago , in Eurpose...

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  18. What was the most significant trend in the evolution of modern man ...

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  19. Evolution of different species in a given area starting from a poi...

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  20. Which one of the following options gives one correct example each ...

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  21. What was the most significant trend in the evolution of modern man ...

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