JEE Revision Plan - Chemistry 7.2 for JEE & BITSAT Exams

Question 1

The observed osmotic pressure for a 0.10 M solution of

at 25 °C is 10.8 atm. The expected and experimental (observed) values of Van’t Hoff factor (i) will be respectively:

Question 2

Determination of the molar mass of acetic acid in benzene using freezing point depression is affected by:

Question 3

A solution is prepared by mixing 8.5 g of

and 11.95 g of CHCl₃. If vapour pressure of

and CHCl₃ at 298 K are 415 and 200 mmHg respectively, the mole fraction of CHCl₃ in vapour form is :
(Molar mass of

)

Question 4

A solution at 20°C is composed of 1.5 mol of benzene and 3.5 mol of toluene. If the vapour pressure of pure benzene and pure toluene at this temperature are 74.7 torr and 22.3 torr, respectively, then the total vapour pressure of the solution and the benzene mole fraction in equilibrium with it will be, respectively:

Question 5

Van der Wall’s equation for a gas is stated as,

This equation reduces to the perfect gas equation,

when,

Question 6

When does a gas deviate the most from its ideal behaviour?

Question 7

The temperature(in K) at which oxygen molecules have the same root mean square speed as helium atoms have at 300 K is : (Atomic masses : He = 4 u, O = 16 u)

Question 8

In a monoclinic unit cell, the relation of sides and angles are respectively:

Question 9

Which one of the following schemes of ordering closed packed sheets of equal sized spheres does not generate close packed lattice-

Question 10

The total number of octahedral void(s) per atom present in a cubic close packed structure is:

Question 11

For the decomposition of the compound represented as

the

.
If the reaction is started with 1 mol of the compound, the total pressure at equilibrium would be:

Question 12

Addition of an inert gas will cause the equilibrium to shift- if it is applied at

Question 13

For the chemical reaction 3X(g) + Y(g)

X₃Y(g), the amount of X₃Y at equilibrium is affected by:

Question 14

Assuming that the degree of hydrolysis is small, the pH of 0.1 M solution of sodium acetate

will be :

Question 15

The equilibrium constant for the reaction N₂+3H₂

2NH₃ is 6.8x10⁵ at 298K. In the presence of catalyst, the equilibrium is attained 5 times faster. Therefore the equilibrium constant in the presence of catalyst at 298K is