Which of the following is paramagnetic ? from Chemistry Chemical

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 Multiple Choice QuestionsMultiple Choice Questions

301.

Which of the following structure of a molecule is expected to have three bond pairs and one lone pair of electrons?

  • Octahedral

  • Trigonal planar

  • Pyramidal

  • Tetrahedral


302.

The paramagnetic molecule at ground state among the following is :

  • H2

  • O2

  • N2

  • CO


303.

The following salt shows maximum covalent character:

  • AlCl3

  • MgCl2

  • CsCl

  • LaCl3


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304.

Which of the following is paramagnetic ?

  • B2

  • C2

  • N2

  • F2


A.

B2

Paramagnetic species has unpaired electron.

(i) B2 = 5 + 5 = 10 = σ1s2, σ*1s2, σ2s2, σ*2s2π2px1, π2py1

(ii) C2 = 6 + 6 =12 = σ1s2, σ*1s2, σ2s2, σ*2s2π2px2, π2py2

(iii) N2 = 7 + 7 = 14 = σ1s2, σ*1s2, σ2s2, σ*2s2π2px2, π2py2, σ2pz2

(iv) F2 = 9 + 9 = 18 = σ1s2, σ*1s2, σ2s2, σ*2s2π2px2, π2py2, π*2px2, π2py2

Therefore, B2 is paramagentic because it has unpaired electron.


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305.

The trigonal bipyramidal geometry results from the hybridisation :

  • dsp3 or sp3d

  • dsp2 or sp2d

  • d2sp3 or sp3d2

  • d3p2 or d2p3


306.

The molecule having smallest bond angle is :

  • H2O

  • H2S

  • NH3

  • H2Te


307.

Which of the following molecules has three-fold axis of symmetry ?

  • NH3

  • C2H4

  • CO2

  • SO2


308.

Electrons in a paramagnetic compound are :

  • shared

  • upaired

  • donated

  • paired


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309.

sp3d hybridization results in :

  • a square planar molecule

  • an octahedron molecule

  • a trigonal bipyramidal molecule

  • a tetrahedron molecule


310.

Which of the following is correct electron dot structure of N2O molecule?

  • :N=N=Ö:

  • :NN+-O....:

  • :N..=N=O....

  • :N..=N-O....


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