Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

31.

Which of the following metals has the largest abundance in the earth's crust? 

  • Aluminium

  • Calcium

  • Magnesium

  • Sodium


32.

For which element the inertness of the electron pair will not be observed? 

  • Sn

  • Fe

  • Pb

  • In


33.

Radioactivity of a sample (Z = 22) decreases 90% after 10 yr. What will be the half-life of the sample? 

  • 5 yr

  • 2 yr

  • 3 yr

  • 10 yr


34.

Vitamin C is

  • citric acid

  • lactic acid

  • paracetamol 

  • ascorbic acid


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35.

Keto - enol tautomerism is not observed in

  • C6H5COC6H5

  • C6H5COCH=CH2

  • C6H5COCH2COCH3

  • CH3COCH2COCH3


36.

Boiling water reacts with C6H5N2+Cl- to give

  • aniline

  • benzylamine

  • phenol

  • benzaldehyde


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37.

PCl5 C2H5Cl, Y PCl5 CH3COCl

X and Y are

  • (C2H5)2O and CH3CO2H

  • C2H5I and C2H5CHO

  • C2H5OH and CH3CO2H

  • C2H5OH and C2H5CHO


C.

C2H5OH and CH3CO2H

X and Y are C2H5OH and CH3CO2H.

C2H5OH PCl5 C2H5Cl + POCl3 + HCl

CH3CO2PCl5 CH3COCl + POCl3 + HCl


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38.

When AgCl is treated with KCN

  • Ag is precipitated

  • a complex ion is formed

  • double decomposition takes place

  • no reaction takes place


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39.

Which one of the following produced when acetone is saturated with HCl gas?

  • Acetone alcohol

  • Phorone

  • Mesityl oxide

  • Benzene


40.

Which one of the following is an example of co-polymer?

  • Buna-S

  • Teflon

  • PVC

  • Polypropylene


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