51.

When common salt is dissolved in water

• the melting point of the solution increases

• the boiling point of the solution increases

• the boiling point of the solution decreases

• both the melting and bolling point of the solution decrease

Which of the following is an intrinsic colloid ?

• Glue

• Arsenic sulphide

• Gold

• All of these

The formula of haematite is

• Fe₃O₄

• Fe₂O₃

• FeCO₃

• FeS₂

Coagulation is not done by

• persistant dialysis

• boiling

• electrophoresis

• peptisation

Hypo is used in photography due to its

• reaction with light

• reducing property

• oxidising property

• complex forming nature

Transitional metal ions have an ability of complex formation. They have this tendency due to

• catalytic property

• high enthalpy of atomisation

• high nuclear charge

• All of the above

The number of octahedral sites per sphere in a fcc structure is

• 1

• 2

• 4

• 8

The method which is used to measure the osmotic pressure of a solution quickly and accurately is

• Berkeley-Hartley's method

• de varies method

• Pfeffer's method

• All of the above

When acetone is treated with dilute alkali, the product obtained is

• mesitylene

• mesityl oxide

• paraldehyde

• phorone

Which of the following monomers, gives synthetic rubber on polymerisation ?

• CH₂=CHCl

• CCl₂=CCl₂

• CH₂=C(CH₃)-CH=CH₂

• CH₂=CCl-CH=CH₂