The number of electrons, neutrons and protons in a species are eq

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 Multiple Choice QuestionsMultiple Choice Questions

441.

Which of the following elements can be involved in  -  bonding?

  • Carbon

  • Nitrogen

  • Phosphorus

  • Boron


442.

Which one ofthe following statements about C2 molecule is wrong?

  • The bond order of C2 is 2.

  • In vapour phase, C2 molecule is diamagnetic.

  • Double bond in C2 molecule consists of both π- bonds because of the presence of 4es- in two π- molecular orbitals.

  • double bond in C2 molecule consists of one σ- bond and on π-bond.


443.

The type of hybridisation in SF6, molecule is

  • sp3d

  • dsp3

  • sp3d

  • d2sp3


444.

Among LiCl, BeCl2, BCl3 and CCl4 the covalent bond character follows the order

  • LiCl < BeCl2 < BCl3 < CCl4

  • BCl3 < CCl4 < BeCl2 < LiCl

  • BeCl2 < LiCl < CCl4 < BCl3

  • CCl4 < BCl3 < BeCl2 < LiCl


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445.

Which of the following has sp2-hybridisation?

  • C2H6

  • C2H4

  • BeCl2

  • C2H2


446.

An sp3-hybrid orbital contains

  • 14 s- character

  • 12 s- character

  • 23 s-character

  • 34 s-character


447.

Hybridisation states of C in CH3+ and CH3- are

  • sp2, sp3

  • sp3, sp2

  • sp, sp2

  • sp2, sp


448.

Which one of the following complexes is outer orbital complex?

  • [Co(NH3)6]3+

  • [Mn(CN)6]4+

  • [Fe(CN)6]4-

  • [Ni(NH3)6]2+


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449.

The correct statement with regard to H2+ and H2- is

  • both H2+ and H2- are equally stable

  • both H2+ and H2- do not exist

  • H2- is more stable than H2+

  • H2+ is more stable than H2-


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450.

The number of electrons, neutrons and protons in a species are equal to 10, 8 and 8 respectively. The proper symbol of the species is

  • O816

  • O818

  • Ne1018

  • O2-816


D.

O2-816

From the given data, the atomic number, Z or number of protons of the species is 8. Number of neutrons is also 8, hence atomic mass is 16. Since, the number of electrons are two more than the number ofprotons, hence it is a bi-negative species. Thus, the species is O2-816


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