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


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38.

The oxidant which is used as an antiseptic is

  • KBrO3

  • KMnO4

  • CrO3

  • KNO3


B.

KMnO4

KMnO4 is a powerful oxidising agent in all mediums and it is used as an antiseptic.


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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


40.

The monomer used to produce orlon is

  • CH2=CHF

  • CH2=CCl2

  • CH2=CHCl

  • CH2=CH-CN


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