Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

41.

Which oxide of nitrogen is coloured gas ?

  • N2O

  • NO2

  • N2O5

  • NO


42.

The purpose of smelting an ore is to :

  • oxidise it

  • reduce it

  • obtain an alloy

  • separate volatile impurities


43.

Which of the following inert gas liquifies easily ?

  • He

  • Kr

  • Ne

  • Ar


44.

The crystal system of a compound with unit cell dimensions , a = 0.387 , b = 0.387 and c = 0.504 run and αβ = 90° and γ = 120° is :

  • cubic

  • hexagonal

  • orthorhombic

  • rhombohedral


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45.

Tincture of iodine is :

  • aqueous solution of I2

  • solution of I2 in aqueous KI

  • alcoholic solution of I2

  • aqueous solution of KI


46.

The reaction of chloroform with alcoholic KOH and p toluidine form :


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47.

Soaps are :

  • Mg salts of lower fatty acids

  • Na salts of lower fatty acids

  • Na salts of higher fatty acids

  • None of the above


C.

Na salts of higher fatty acids

Na (sodium) salts of higher fatty acids are known as soap and the process by which soap is prepared is known as saponification .


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48.

Which one of the following does not participate in the carbylamine reaction ?

  • KOH

  • Ethanol

  • Chloroform

  • Aniline


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49.

Alkyl halides react with Mg in dry ether to form :

  • magnesium halide

  • Grignard's reagent

  • alkene

  • alkyne


50.

What is the product B in the following reaction sequence ?

CH3-CO||-CH3 KCN / H2SO4 A LiAlH4 B

  • (CH3)2-C(OH)-COOH

  • (CH3)2-C(OH)-CH2NH2

  • (CH3)2-CH-CN


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