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JEE Chemistry Solved Question Paper 2013

Multiple Choice Questions

41.

excess of PCl₅ reacts with concentrated H₂SO₄ giving

chlorosulphuric acid
sulphurous acid
sulphury chloride
thionyl chloride

42.

Which one of the following shows highest magnetic moment?

Fe²⁺
Co²⁺
Cr³⁺
Ni²⁺

43.

The emf of a galvanic cell constituted with the electrode Zn²⁺|Zn (-0.76V) and Fe²⁺|Fe (-0.41V) is

-0.35V
+ 1.17V
+0.35V
-1.17V

44.

Which of the following is not a colligative property?

Elevation in boiling point
Depression in freezing point
Osmotic pressure
Lowering of vapour pressure

45.

3 g of urea is dissolved in 45 g of H₂O. The relative lowering in vapour pressure is

0.05
0.04
0.02
0.01

46.

Metallic lustre is due to

high density of metals
high polish on the surface of metals
reflection of light by mobile electrons
chemical inertness of metals

47.

Which of the following aqueous solution will exhibit highest boiling point?

0.01M urea
0.01 M KNO₃
0.01M Na₂SO₄
0.015M C₆H₁₂O₆

48.

Glucose when reduced with HI and red phosphorus gives

n-hexane
n-heptane
n-pentane
n-octane

49.
Oils are liquids at room temperature since they contain higher percentage of

oleates

palmitates

stearates

myristates

oleates

Oils, which are liquids at ordinary temperatures, contain a large proportion of unsaturated acids, like oleic acid, linoleic acid, linolenic acid .The facts which are solids at ordinary temperatures, contain a large proportion of saturated acids, like-myristic acid, palmitic acid, steanc acid eg, glyceryl trioleate, which contains unsaturated acids components is an oil. Glyceryl tnstearate which contains only saturated acids component is a fat.