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 .
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
Tincture of iodine is :
aqueous solution of I2
solution of I2 in aqueous KI
alcoholic solution of I2
aqueous solution of KI
Soaps are :
Mg salts of lower fatty acids
Na salts of lower fatty acids
Na salts of higher fatty acids
None of the above
Which one of the following does not participate in the carbylamine reaction ?
KOH
Ethanol
Chloroform
Aniline
Alkyl halides react with Mg in dry ether to form :
magnesium halide
Grignard's reagent
alkene
alkyne
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