Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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11.

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 possesses see-saw geometry, which can be regarded as a distorted trigonal bipyramidal structure, having one lone pair of electrons in the basal position of the trigonal bipyramid. See-saw geometry of SeCl4 molecules arises due to the sp3d hybridisation of the central atom. The distortion in shape is due to the presence of one lone pair of electrons.


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12.

Green chemistry means such reactions which

  • are related to the depletion of ozone layer

  • study the reactions in plants

  • produce colour during reactions

  • reduce the use and production of hazardous chemicals.


13.

Identify the final product.

  • None of these


14.

C6H6  H2SO4HNO3 X FeCl3Cl2 Y

In the above sequence Y can be

  • 3-nitrochlorobenzene

  • 1-nitrochlorobenzene

  • 4-nitrochlorobenzene

  • none of these


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15.

Which of the following is aromatic?


16.

Assertion :Tertiarycarbonium ions are generally formed  more easily than primary carbonium ions.

Reason : Hyperconjugation as well as inductive effect due to additional alkyl groups stabilize tertiary carbonium ions.

  • 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.


17.

Assertion : Pyrrole is an aromatic heterocyclic compound.

Reason : It has cyclic delocalised 6π electrons.

  • 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.


18.

For the reaction, 2NO2 + F2 2NO2F,  following mechanism has been provided.

NO2 + F2 slow NO2F + F

NO2  + F  fastNO2F

Thus, rate expression of the above reaction can be written as

  • r= k [NO2]2[F2]

  • r = k [NO2][F2]

  • r = k [NO2]

  • r = k [F2]


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19.

What is the correct relationship between the pHs of isomolar solutions of sodium oxide (pH1), sodium sulphide (pH2), sodium selenide (pH3) and sodium telluride (pH4)?

  • pH1 > pH2 = pH3 =pH4

  • pH1 <pH2 < pH3 <pH4

  • pH1 < pH2 > pH3< pH4

  • pH1> pH2 > pH3 > pH4


20.

Which of the following is considered as an anticancer species?


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