The ONO angle is maximum in from Chemistry Chemical Bonding and

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 Multiple Choice QuestionsMultiple Choice Questions

581.

Assertion : SeCl4 does not have a tetrahedral structure.

Reason : Se in SeCl4 has two lone pairs.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


582.

Assertion : B2 molecule is diamagnetic.

Reason : The highest occupied molecular orbital is of σ type.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


583.

The paramagnetic species is

  • KO2

  • SiO2

  • TiO2

  • BaO2


584.

The ion which is not tetrahedral in shape is

  • BF4-

  • NH4+

  • Cu(NH3)42+

  • NiCl42-


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585.

The statement true for N3- is

  • it has a non-linear structure

  • it is called pseudohalogen

  • the formal oxidation state of nitrogen in this anion is -1

  • it is isoelectronic with NO2


586.

Which of the following molecule has highest bond energy ?

  • F-F

  • N-N

  • C-C

  • O-O


587.

Shape of O2F2 is similar to that of

  • C2F2

  • H2O2

  • H2F2

  • C2H2


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588.

The ONO angle is maximum in

  • NO3-

  • NO2-

  • NO2

  • NO2+


D.

NO2+

The nitrate ion has three resonance structure, with the double bond on a different oxygen for each. In all resonance structures the nitrogen has three bonds, therefore, its hybridisation is sp2. Each of the oxygen atoms also has sp2 hybridisation, since the hybridisation is determined by the resonance structure with the double bond, where the oxygen has a double bond and two lone pairs.

The actual geometry of the polyatomic ion is trigonal planar with bond angles of 120°,

NO2-:18 electrons; ideal geometry trigonal planar, sp2 with bond angle of 116°.

NO2 : 17 electrons, ideal geometry trigonal planar; sp2 with bond angle of 134°.

NO2+: 16 electrons; ideal geometry linear ; sp with bond angle of 180°,

               O....=N+=O....


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589.

The number of σ and π bonds present in pent-4-ene, I-yne is :

  • 10 , 3

  • 4 , 9

  • 3 , 10

  • 9 , 4


590.

The dipole moment is the highest for

  • trans-2-butene

  • 1,3-dimethylbenzene

  • acetophenone

  • ethanol.


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