Which of the following orders regarding ionisation energy is corr

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321.

Which of the following orders regarding ionisation energy is correct?

  • N > O > F

  • N < O < F

  • N > O < F

  • N < O < F


C.

N > O < F

Ionisation energy is the energy required to remove an electron from outer shell of an atom. Since, on moving from left to right in a period, size decreases, thus, larger amount of energy is required to remove an electron, i.e. ionisation energy increases.

The size of Oxygen atom is smaller as compared to Nitrogen but the ionisation energy of Nitrogen is higher. This is mainly because in Nitrogen, the electron is to be removed from half-filled 2p3 orbital.

Thus, the correct order of ionisation energy is O < N < F.


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322.

Identify [A] and [B] in the following

Ac89227 -β [A] -α [B] -α Rn

  • Po, Rn

  • Th, Po

  • Ra, Th

  • Th, Ra


323.

The electronic configuration 1s2, 2s22p6, 3s23p63d9 represents a

  • metal atom

  • non metal atom

  • non-metallic anion

  • metallic cation


324.

In a given shell the order of screening effect is

  • s > p > d > f

  • s > p > f > d

  • f > d > p > s

  • s < p < d < f


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325.

Identify the least stable ion amongst the following.

  • Li-

  • Be-

  • B-

  • C-


326.

The ionisation energy of hydrogen atom is 13.6eV. What will be the ionisation energy of He+?

  • 13.6 eV

  • 54.4 eV

  • 122.4 eV

  • Zero


327.

Which element has highest electronegativity ?

  • F

  • He

  • Ne

  • Na


328.

The correct order of radii is

  • N <Be <B

  • F-<O2-<N3-

  • Na< Li< K

  • Fe3+< Fe2+< Fe4+


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329.

Which of the following element shows maximum valency ?

  • Carbon

  • Barium

  • Nitrogen

  • Sulphur


330.

The metal used to recover copper from a solution of CuSO4 is :

  • Fe

  • He

  • Na

  • Ag


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