Multiple Choice QuestionsTincture 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 .
What is the product B in the following reaction sequence ?
CH3--CH3 A B
(CH3)2-C(OH)-COOH
(CH3)2-C(OH)-CH2NH2
(CH3)2-CH-CN
C.
(CH3)2-C(OH)-CH2NH2
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 .
Alkyl halides react with Mg in dry ether to form :
magnesium halide
Grignard's reagent
alkene
alkyne
B.
Grignard's reagent
+ Mg R-MgX
The R MgX formed is known as Grignard reagent after the name of its discoverer .
Which one of the following does not participate in the carbylamine reaction ?
KOH
Ethanol
Chloroform
Aniline
B.
Ethanol
The crystal system of a compound with unit cell dimensions , a = 0.387 , b = 0.387 and c = 0.504 run and = = 90° and = 120° is :
cubic
hexagonal
orthorhombic
rhombohedral
B.
hexagonal
Given , a = b ± c and = = 90° , = 120°
Hence , the crystal system is hexagonal .
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 .
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 .
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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