Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

41.

Tincture of iodine is :

  • aqueous solution of I2

  • solution of I2 in aqueous KI

  • alcoholic solution of I2

  • aqueous solution of KI


C.

alcoholic solution of I2

Tincture of iodine is 2 - 3 % iodine solution in alcoholic water .


42.

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


C.

(CH3)2-C(OH)-CH2NH2


43.

Which of the following inert gas liquifies easily ?

  • He

  • Kr

  • Ne

  • Ar


A.

He

The inert gases are not easily liquified .The ease of liquification increases down the group from He to Rn due to increase in atomic size and therefore , increase in van der Waal's forces .


44.

Alkyl halides react with Mg in dry ether to form :

  • magnesium halide

  • Grignard's reagent

  • alkene

  • alkyne


B.

Grignard's reagent

R-Xalkyl hallide + Mg dry ether R-MgX

The R MgX formed is known as Grignard reagent after the name of its discoverer .


45.

Which oxide of nitrogen is coloured gas ?

  • N2O

  • NO2

  • N2O5

  • NO


B.

NO2

NO2 (nitrogen dioxide) is a brown coloured gas .


46.

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

  • KOH

  • Ethanol

  • Chloroform

  • Aniline


B.

Ethanol


47.

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


B.

hexagonal

Given , a = b ± c and αβ = 90° , γ = 120°

Hence , the crystal system is hexagonal .


48.

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


D.

This reaction is known as carbylamine reaction .

Note : This reaction is specific for aliphatic and aromatic primary amines .


49.

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 .


50.

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 .