Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

51.

Which ofthe following is true regarding teflon ?

  • It is a linear, unbranched polymer of tetrafluoro ethylene

  • It has very high thermal stability

  • Polymer molecules are associated by strong dipole-dipole attraction

  • All of the above


52.

Cellulose has very high degree of hydrophilicity because of :

  • its amorphous nature

  • crystalline nature

  • presence of excessive voids in solid state

  • presence of many hydroxyl groups on the polymer back bone


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53.

By adding sodium dodecyl sulphate, during the electrophoresis of proteins, it is possible to :

  • determine a protein's isoelectric point

  • determine an enzyme's specific activity

  • determine the amino acid composition of the protein

  • presence a proteins native structure and biological activity


D.

presence a proteins native structure and biological activity

Adding sodium dodecyl sulphate during electrophoresis of amino acids preserve the proteins native structure and biological activity .


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54.

Which of the following aldoses gives an optically active compound upon reaction with warm dilute nitric acid ?


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55.

In the α-helix , the hydrogen bonds

  • are roughly parallel to the axis of the helix

  • are roughly perpendicular to the axis of the helix

  • occur mainly between electronegative atoms of the R groups

  • occur only between some of the amino acids of the helix


56.

Which one ofthe following antioxidant commonly used to increase the storage life of butter ?

  • Butylated hydroxy anisol

  • Sodium sulphite

  • Sodium metabisulphite

  • All of the above


57.

CH3CHO Oxidation (A0 PCl5 (B) CH3COONa (c) .Compond (C) is :

  • (CH3CO)2O

  • CH3COCH3

  • CH3COOCH3

  • CH3COOC2H5


58.

The strongest acid among the following compound is :

  • HCOOH

  • CH3CH2CH(Cl)COOH

  • ClCH2CH2CH2COOH

  • CH3COOH


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59.

Phenol , when it first react with cone. sulphuric acid and then with cone. nitric acid gives :

  • nitrobenzene

  • 2 , 4 , 6 - trinitrobenzene

  • o - nitrophenol

  • p - nitrophenol


60.

During dehydration of alcohols to alkenes by heating with conc. H2SO, the initial step is :

  • formation of an este

  • protonation of alcohol molecule

  • formation of carbocation

  • elimination of water


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