Assertion : SeCl4 does not have a tetrahedral structure.Reason :

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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.


C.

If assertion is true but reason is false.

SeCl4 posses see saw geometry, which can be regarded as a distorted trigonal bipyramidal structure, having one lone pair (lp) of electrons in the basal position of the trigonal bi-pyramidal. It arises due to sp3d hybridisation of the central atom. The distortion is basically due to the presence of one lone pair of electrons.


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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


588.

The ONO angle is maximum in

  • NO3-

  • NO2-

  • NO2

  • NO2+


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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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