If the bond energies of H-H, Br-Br and H-Br are 433, 192 and 364

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 Multiple Choice QuestionsMultiple Choice Questions

291.

The correct arrangement of the species in the decreasing order of the bond length between carbon and oxygen in them is

  • CO, CO2, HCO2-, CO32-

  • CO2,CO, CO32-, HCHO2-

  • CO32-, HCO2-, CO2, CO

  • CO, CO32-, CO2, HCO2-


292.

A correct statement is

  • [Co(NH3)6]2+ is paramagnetic

  • [MnBr4]2- is tetrahedral

  • [CoBr2(en)2]- exhibits linkage isomerism

  • [Ni(NH3)6]2+ is an inner orbital complex


293.

Which one of the following conversion results in the change of hybridisation and geometry?

  • CH4 to C2H2

  • NH3 to N+H4

  • BF3 to BF4-

  • H2O to H3O+


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294.

If the bond energies of H-H, Br-Br and H-Br are 433, 192 and 364 kJ mol-1 respectively, then H° for the reaction-

H2 (g) + Br2 (g) → 2HBr (g) is

  • -261 kJ

  • +103 kJ

  • +261 kJ

  • -103 kJ


D.

-103 kJ

In the above given reaction,

Given, 

  BE (H-H) = 433 kJ mol-1

BE (Br-Br) = 192 kJ mol-1

 BE (H-Br) = 364 kJ mol-1

 HR° = ΣBE (reactants) - ΣBE(products)     HR° = (433 + 192) - (2 × 364)     HR° = 625 - 728             = -103 kJ mol-1 


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295.

The shape of XeFis

  • square planar

  • distorted octahedral

  • square pyramidal

  • pyramidal


296.

CO is a stronger ligand than Cl-, because

  • CO is a neutral molecule

  • CO has π-bonds

  • CO is poisonous

  • CO is more reactive


297.

Which of the following sequence is correct regarding field strength of ligands as per spectrochemical series?

  • SCN- < F- < CN- < CO

  • F- < SCN- < CN- < CO

  • CN- < F- < CO < SCN-

  • SCN- < CO < F- < CN-


298.

The increasing order of bond order of O2, O2+, O2- and O22- is

  • O2+ < O2 < O2- < O22-

  • O22- < O2- < O2+ < O2

  • O2 < O2+ < O2- < O22-

  • O22- < O2- < O2 < O2+


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299.

Main axis of diatomic molecule is z. The orbitals px and py overlap to form

  • π-molecular orbital

  • σ-molecular orbital

  • δ-molecular orbital

  • No bond is formed


300.

Using MOT, compare O2+ and O2- species and choose the inncorrect option.

  • O2+ have higher bond order than O2-

  • O2- is less stable

  • O2+ is diamagnetic while O2- is paramagnetic

  • Both O2- and O2+ are paramagnetic


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