84.

88.

86.

87.

88.

89.

90.

91.

Lactose is a disaccharide made up of :
(^) Glucose and Fructose (B) Two glucose units
(C) Two galactose units (D) Glucose and Galactose

Arrange the following nucleophiles in the decreasing order of their nucleophilicity
NH,., NH,, C,H, NH,, C;H, NH,

(&) NH,. >NH, > C,H,NH, > C;H,NH,
(8 NH, >C,H,_NH, > NH, > CH,_NH,
© NH, >NH, > CH, NH, > C,H, NH,
(2) യു > CH_NH, > C;H, NH, > NH,

Sx1 mechanism operates in the hydrolysis of :

(ಯ) t-Butyl chloride (B) methyl chloride
(©) ethyl chloride (D) iso-Propyl chloride

Temporary hardness of water is due to the presence of :
(4) Chlorides of Ca and Mg (B) - Bicarbonates of Ca and Mg
(C) Sulphates of Ca and Mg (D) Nitrates of Ca and Mg

A gulphide ore of Iron is :
(മ) Magnetite (2) Haematite
(@) Limonite (D) Iron pyrites

The most covalent aluminium halide is : ⇁
(A)Aluminiumchlon'de (B) Aluminium bromide
(C) Aluminium fluoride (D) Aluminium iodide

The crystal system defined bya=b=cand a = =y # 90" is called :
(^) Rhombohedral ` @) Triclinic
(@ Orthorhombic (D) Tetragonal

For the reaction A — Product(s) when the concentration of A is doubled, the rate becomes
8 times. The order of the reaction is :

@ 4 ® 1
0 3 യ 2

13 124/2015
[P.T.0.]