excess of PCl₅ reacts with concentrated H₂SO₄ giving

• chlorosulphuric acid

• sulphurous acid

• sulphury chloride

• thionyl chloride

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

Which of the following is not a colligative property?

• Elevation in boiling point

• Depression in freezing point

• Osmotic pressure

• Lowering of vapour pressure

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

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

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

• 0.01M urea

• 0.01 M KNO₃

• 0.01M Na₂SO₄

• 0.015M C₆H₁₂O₆

Glucose when reduced with HI and red phosphorus gives

• n-hexane

• n-heptane

• n-pentane

• n-octane

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

• oleates

• palmitates

• stearates

• myristates

The number of disulphide linkages present in insulin are

• 4

• 3

• 2

• 1