Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

31.

In aluminium extraction by the Bayer process, alumina is extracted from bauxite by sodium hydroxide at high temperatures and pressures

Al2O3(s) + 2OH-(aq)  2Al2O2-(aq) + H2O(l)

Solid impurities such as Fe2O3 and SiO2 are removed and then Al(OH)4- is reprecipitated

2Al(OH)4-  Al2O3·3H2O(s) +2OH-(aq).In the industrial world

 

  • carbon dioxide is added to precipitate the alumina

  • temperature and pressure are dropped and the super saturated solution seeded

  • both (A) and (B) are practised

  • the water is evaporated


32.

Reaction of R OH with R' MgX produces

  • RH

  • R' H

  • R - R

  • R'- R'


33.

Which statement is incorrect?

  • Phenol is a weak acid

  • Phenol is an aromatic compound

  • Phenol liberates CO2 from Na2CO3 solution

  • Phenol is soluble in NaOH


34.

In which of the following reactions new carbon-carbon bond is not formed ?

  • Cannizaro reaction

  • Wurtz reaction

  • Aldol condensation

  • Friedel-Craft reaction


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35.

Which one of the following is called a carbylamine?

  • RCN

  • RCONH2

  • RCH= NH

  • RNC


36.

For making distinction between 2-pentanone and 3-pentanone, the reagent to be employed is

  • K2Cr2O7/H2SO4

  • Zn-Hg/HCl

  • SeO2

  • Iodine/NaOH


37.

The catalyst used for olefin polymerisation is

  • Ziegler-Natta catalyst

  • Wilkinson catalyst

  • Raney nickel catalyst

  • Merrifield resin


38.

The oxidant which is used as an antiseptic is

  • KBrO3

  • KMnO4

  • CrO3

  • KNO3


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39.

Which of the following contributes to the double helical structure of DNA ?

  • Hydrogen bond

  • Covalent bond

  • Disulphide bond

  • van der Waals' force


A.

Hydrogen bond

According to double helical model of DNA (proposed by Watson and Crick), DNA molecule contains two deoxyribonuclide chains which are spirally coiled around each other on a common axis. These two chains are held together by the formation of hydrogen bonds,

                              


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40.

The monomer used to produce orlon is

  • CH2=CHF

  • CH2=CCl2

  • CH2=CHCl

  • CH2=CH-CN


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