The correct order of radii is from Chemistry Classification of E

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 Multiple Choice QuestionsMultiple Choice Questions

321.

Which of the following orders regarding ionisation energy is correct?

  • N > O > F

  • N < O < F

  • N > O < F

  • N < O < F


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


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328.

The correct order of radii is

  • N <Be <B

  • F-<O2-<N3-

  • Na< Li< K

  • Fe3+< Fe2+< Fe4+


B.

F-<O2-<N3-

These are isoelectronic species and their radii decreases with increasing their atomic number due to increasing effective nuclear charge (Zeff).

       Zeff= Z-σ

where, Zeff = effective nuclear charge, Z= atomic number and σ= screening constant. For F-, O2- and N3-, the value of σ is the constant due to equal number of electron. So order of Zeff  is F > O2-> N3-, hence, order of radii is 

                        F-< O2-<N3-radii1Zeff


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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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