12th Class CBSE Chemistry Solved Question Paper for Examination 2015

12th Class CBSE Chemistry Solved Question Paper for Examination 2015 - All students who will appear in Class 12th examination held in March/April 2015 can find here Chemistry solved model question papers online. These all Multiple Choice Questions (MCQ) will help you for better examination preparation.

1. What is purple of cassius?

2. Write the name of two metals which can be extracted by self reduction process.

3. How many tetrahedral and octahedral voids present per unit cell in fcc structure?

4. Write the name of product formed when glucose is oxidised by nitric acid and by Br₂ water.

5. Name any two fillers present in laundry soap?

6. Calculate the molality of orthophosphoric acid solution in which the mole fraction of orthophosphoric acid is 0.20.

7. Give equation for:
(i) Preparation of KMnO₄ from pyrolusite
(ii) Action of heat on K₂Cr₂O₇

8. The initial amount of reactant is 40 gm and its half life period is 10 minutes. If reaction follow zero order kinetics, how much reactant is left after 20 minutes?

9. Write the name and formula of monomers of the following polymers :
Nylon-6 and Glyptal.

10. Give any two examples of broad spectrum antibiotic.

11. How the mixture of ZnS and PbS are separated by froth floatation method. Write the name of method and equation by which nickel metal is purified?

12. A solid containing three elements x, y and z present at each corner, alternate face centre and alternate edge centre respectively. What is the formula of solid?

13. Write the equation of Freundlich adsorption isotherm and plot a graph of log m/x versus logP; also write the slope and intercept. Is Freundlich isotherm applicable at high pressure?

14. Write IUPAC name of linkage isomer of [CoCl(en)₂NO₂]⁺

15. Explain nature of bonding in [Ni(CO)₄].

16. Write four differences between solution showing positive deviation and negative deviation from Raoult’s law and give one example of each.

17. Why aniline on nitration (HNO₃ + H₂SO₄) gives ortho-nitro aniline in much lesser amount than meta nitro aniline while –NH₂ group is ortho-para directing? What is the approximate percentage of each isomer formed?

18. Give equation for coupling reaction.

19. Write the structure of DDT and one of its main use.

20. Define:
(i) Mutarotation
(ii) Inversion of cane sugar
(iii) Reducing sugar

21. The three electrolytic cells x, y and z connected in series containing AlCl₃, AgNO₃ and MgCl₂ electrolytes respectively. A steady current of 10 ampere is passed till 4.5 g Al is deposited at cathode of cell x. Calculate the mass of Ag and Mg deposited and time for passing current (Atomic wt. of Zn = 65, Ag = 108 and Al = 27).

22. How sulphuric acid is manufactured by the Contact process? Give the reaction of concentrated sulphuric acid with C, S, Cu and sucrose.

23. Give equations for preparation of HNO3 by Ostwald’s process. Give reaction which takes place:
(a) S and conc. HNO₃
(b) Cu and conc. HNO₃
(c) C and conc. HNO₃

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