CHEMISTRY TEST OF CLASS 12TH

                 CHEMISTRY  TEST OF CLASS 12^TH                                                                                         

                                                                               
                                                                 ^BY:-HIMANSHU SIR

                          PART  A                               30 min
 

Q1. For the reaction A -> B the rate becomes 27     imes when the concentration of A is increased 3 times. What is the order of reaction

Q. 2. Discuss the nature of bonding in the following coordination entities on the basis of valence bond theory: [Co(C2O3)3]3– (iv) [CoF6]3–

Q. 3. Give evidence that [Co(NH3)5Cl]SO4 and [Co(NH3)5SO4]Cl are ionisation isomers?

Q. 4. What do you understand by activation of adsorbent? How is it achieved?Or

Calculate the efficiency of packing in case of a metal crystal for face-centred cubic?

Q. 5. What role does adsorption play in heterogeneous catalysis? Or

How will you distinguish between the Hexagonal close-packing and cubic close-packing?

Q.6. A 5% solution (by mass) of cane sugar in water has freezing point of 271K. Calculate the freezing point of 5% glucose in water if freezing point of pure water is 273.15 K ?

Q.7. State Henry’s law and mention some important applications?

Q.8. Resistance of conductivity cell filled with 0.1molL-1 KCl solution is 100 ohm. If the resistance of the same cell when filled with 0.02molL-1 KCl solution is 520 ohm. Calculate the conductivity & molar conductivity of 0.02molL-1 KCl solution. The conductivity of 0.1 molL-1 solution of KCl is 1.29Sm-1?.