Question No. 1 to 10 are short answer type. Answer any 10 question. Each question carries 2 marks.
1.What are f-centres in a crystal?
2- Silver crystalline with FCC unit cell. Each side of unit cell has length of 409pm. What is the radius of Ag atom?
3- what is half life period? write expression for half life period of a first order reaction.
4- (a) what do you mean by azerotropic mixture?
(b) Describe Raoult’s law of lowering of Vapour pressure?
5- Diamond is a conductor of electricity but graphite is a good conductor of electricity. Explain.
6-Determine the equilibrium constant of the following reaction at 294K
Given E0(Sn4+/sn2+) = 0.15V E0(Fe3+/Fe2+)=0.77V
= Fe3+ +Sn2+ 2Fe2+Sn4+
7- State and Explain faraday’s of electrode.
8- Distinguish between lyophilic and lyophobic colloids
or Sodium form Fcc crystals. Calculate the atomic radius of sodium if the length of the side of a unit cell of sodium is 351pm.
9- Define n-type and p-types.
or What is enzyme. Explain with example.
10- Write Difference between physical adsorption and chemical adsorption.
or write difference between ideal and Non-ideal.
Long Answer Type Questions
11 (a) first order reaction is 20% complete in 10 minutes. Calculate the time for 75% completion of reaction.
(b) Calculate the mole fraction of benzene of solution containing 30% by mass in carbon- tetra chloride.
12.(a) Difference between order of reaction & molacularity of reaction.
(b)When rate of reaction increase the temp. why?
13.(a) Write cell reation and draw the construction of Daniell cell
(b) What do you mean by order of reaction.
14- Define the following from
(a) Catalyst
(b) emulsion