Which of the following statements is not an essential feature of

Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

21.

Which of the following is a favourable factor for cation formation ?

  • Low ionisation potential

  • High electron affinity

  • High electronegativity

  • Small atomic size


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22.

Which of the following statements is not an essential feature of an optically active molecule ?

  • It will rotate the plane of polarised light

  • It will have a non-superimposable mirror image

  • It will have no element of symmetry

  • It will have an asymmetric carbon atom


D.

It will have an asymmetric carbon atom

Presence of an asymmetric carbon is not essential for optical activity.


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23.

Which one of the following is the most stable reactive intermediate?


24.

The reagent which could distinguish between 1-hexyne and 1-hexene is :

  • Ag(NH3)2+

  • KMnO4

  • Br2 in CCl4

  • H2SO4


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25.

Choose the correct reagent required to carry out the transformation :

  • Zn + conc. HCl

  • conc. H2SO4

  • Li then H2O

  • H2/Pt


26.

Which is maximum hydrated ?

  • NaCl

  • MgCl2

  • AlCl3

  • SiCl4


27.

Ozone layer is being depleted. This is due to :

  • NO (nitric oxide) emission from supersonic jets

  • chlorofluoro carbon used as aerosols

  • Both (a) and (b)

  • None of the above


28.

Arrange the following compounds in increasing order of rate of reaction towards nucleophilic substitution :

  • I < II < III

  • I < III < II

  • III < II < I

  • II < III < I


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29.

Which can dissolve I2 ?

  • KI

  • NaI

  • LiI

  • HI


30.

The oxygen carrying pigment , oxyhaemocyanin containing two copper ions is diamagnetic , because :

  • the two copper ions are in + 1oxidation state

  • one copper ion is in + 1oxidation state while other is in + 2 oxidation state

  • of the strong antiferromagnetic interactions between two copper ions

  • of the ferromagnetic interactions between the two copper ions


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