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


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42.

The purpose of smelting an ore is to :

  • oxidise it

  • reduce it

  • obtain an alloy

  • separate volatile impurities


B.

reduce it

Smelting involves more than just ' melting the metal out of its ore ' .The purpose of smelting an ore is to reduce it .


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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 :


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


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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