Except for the following questions, all the remaining questions have been asked in Set I.
Q. 1. What happens when ferrimagnetic is heated at 850 K and why? 1
Q. 2. A and B liquids on mixing produce a warm solution. Which type of deviation from Raoult's law is there? 1
Q. 3. How is acetone obtained from 2-bromopropane? 1
Q. 4. How is phenol obtained from aniline? 1
Q. 6. Justify the following statements: 2 (a) An ezothermic reaction is always thermodynamically spontaneous.
(b) The entropy of a substance increases on going from liquid to vapour state at any temperature.
Q. 8. (a) The standard reduction potential for the Zn2+(aq) I Zn (s) half cell is 0.76 V. Write the reactions occu ring at the electrodes when coupled with standard hydro gen electrode (SHE).
(b) Can a nickel spatula be used to stir a solution of CuSO4 ? Support your answer with reason .2
Q. 10. Give reasons:
(a) Xenon does not form fluorides such as XeF3 and XeF5 . (b) Out of noble gases, only Xenon is known to form real chemical compounds.
Q. 13. Justify the following statements: 3
Q. 23. (a) List two major classes of antibiotics and give one example of each class. (b) Write one example of each of the following: (i) Azo dye (ii) Anthraquinone dye 3
Q. 25. Name the chief ores of zinc and mercury. Describe the reactions involved in the extraction of these metals from the respective ores. 5