model question paper pcmb NCERT

[AMARNATH B N]

please support me to get model question paper pcmb NCERT with answers which will helps me for main exams in 2015 march

[Raman Vij]

Hello friend as you want the Model Question Papers of Physics, Chemistry, Mathematics, Biology so here I am providing you the same….

1. The question paper has four parts: A, B, C and D. All parts are compulsory.
2. Write balanced chemical equations and draw labelled diagrams wherever required.
3. Use log tables and the simple calculators if necessary.
(Use of Scientific Calculators is not allowed)

PART- A
I. Answer ALL of the following. ( Each questions carries 1 mark) 10 × 1 = 10
1. State Henry’s law.
2. What is the conclusion drawn when Vant Hoff’s factor of a solution is less than one?
3. How molar conductivity varies with dilution?
4. Mention one criterion for intermolecular collisions of two reactants to be effective.
5. Name the metal that is refined by Van Arkel method.
6. Name the first noble gas compound prepared by Neil Bartlett?
7. Give an example for Heteroleptic complex.
8. Write the IUPAC name for CH3-CH(CH3)-CH2Cl.

PART- B
II. Answer Any FIVE of the following. ( Each questions carries 2 mark) 5 × 2 = 10
11. a) Give one example for paramagnetic substance.
b) Which type of binding force existing in ice?
12. Write anodic and cathodic half-cell reactions taking place in Daniel cell.
13. Show that for first order reaction t87.5% = 3 t50%.
14. What is lanthanide contraction? What is the cause for it?
15. How do you convert bromoethane into tertiary-butylethyl ether? Give the chemical equation of the
reaction.
16. What is Stephen’s reaction? Give the chemical equation of the reaction.
17. What is the therapeutic action of a) Paracetamol b) Barbituricacid.
18. What are anionic detergents? Give an example.

PART- C
III. Answer Any FIVE of the following. ( Each questions carries3 mark) 5 × 3 = 15
19. Explain the extraction of aluminium from purified alumina by Hall-Heroult process.
20. Explain manufacture of nitric acid by Ostwald’s process.
21. a) How is ozonised oxygen prepared?
b) Write the structure of sulphurous acid. 1
22. a) How does phosphorus react with limited amount of chlorine? Give equation.
b) What is the product obtained by the reaction between fluorine in excess of bromine?
23. a) 3d Transition metals and their compounds are good catalysts. Give two reasons?
b) Give the formula for the calculation of spin only magnetic moment.
24. Explain the manufacture of Potassium dichromate from chromite ore.
25. Using VBT explain,
i) Geometry of the complex
ii) Type of hybridization, in the complex ion [CoF6] 3-.
iii) Is it an inner or outer orbital complex?
26. a) Draw the structures of cis -trans isomers for [Pt (NH3)2.Cl2].
b) How many ions are produced from the aqueous solution of complex K3[Al(C2O4)3]

PART –D
IV. Answer Any THREE of the following. ( Each questions carries5 mark) 3 × 5 = 15
27. a) Calculate the packing efficiency in a Face Centered Cubic lattice. 3
b) If a metal with atomic mass 209 crystallizes in a simple cubic lattice what is the edge length of its unit
cell. (Given d = 91.5 kg m-3). 2
28. a) 5.8g of a non-volatile solute was dissolved in 100g of carbon disulphide (Molar mass = 76). The
vapour pressure of the solution was found to be 190mmHg. Calculate the molecular mass of the solute.
The vapour pressure of pure carbon disulphide 195 mm Hg. 3
b) What are azeotropes? Give an example.
29. a) The resistance of M/10 solution is found to be 2.5 X 103 ohms. Calculate molar conductance (Given Cell
constant = 1.15 cm-1). 3
b) Mention two general methods for prevention of corrosion. 2
30. a) Derive an expression for rate constant of a first order reaction.
b) What is the effect of positive catalyst on energy of activation? 1
31. a) Mention two factors which affect adsorption of a gas on a solid.
b) Is synthesis of ammonia by Haber’s process, a homogeneous or heterogeneous catalysis?
c) State Hardy-Schulze rule. Among Al2(SO4)3 and (NH4)3PO4 which is better coagulating agent for a
negative sol ?





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Hi buddy here i am looking for National Council of Educational Research and Training (NCERT) 12th PCMB Model Question Paper for its exam preparation so will you plz let me know about the same here ??

[sumit]

As you are asking for National Council of Educational Research and Training (NCERT) 12th PCMB Model Question Paper , so on your demand i am providing same here :

Model Question Paper for Class XII
Biology
MCQs Mark 01
Tick the correct statement
1. What would happen if corpus luteum is not degenerated
(a) Progesterone will not be secreted
(b) Endometrium will disintegrate
(c) Proliferation of endometrium will take place
(d) Ovulation will take place
2. Klinefelten syndrome has the genetic make up
(a) 44 autosomes + xxy
(b) 44 autosomes + xo
(c) 45 autosomes + xx
(d) 45 autosomes + xy
3. Cleistogamous flowers are invariably autogamous because
(a) These flowers do not open at all.
(b) There is no chance of cross pollen landing on the stigma.
(c) These flowers have exposed anthers and stigma.
(d) These flowers are wind pollinated.
4. Which of the following statements is correct
(a) Surgical methods of contraception does not prevent gamete formation
(b) In E.T techniques, embryos are always transferred into the uterus
(c) Oral pills are very popular contraceptives among the rural women
(d) All STDs are not completely curable.
5. Non coding sequences present within a gene is called:
(a) Exon
(b) Operon
(c) Promoter
(d) Intron
1
6. Which of the following DNA sequences would a Restriction enzyme recognize and
cut?
(a) ATGCAC
TACGTG
(b) GATATC
CTATAG
(c) TAGATA
ATCTAT
(d) AATATA
TTATAT
7. The conditions of the earth atmosphere conducive for the origin of life were:
(a) Presence of high temperature, CH4, NH3, and O3
(b) High temperature, CH4, NH3, volcanic eruption
(c) High temperature, volcanic eruption, O2, NH3
(d) Volcanic eruption, CH3, NH3 and O2
8. To analyse the genotype of an organism, it is made to
(a) Self cross
(b) Cross with recessive parent
(c) Cross with dominant parent
(d) Cross with another species
9. An inverted Pyramid of biomass is represented by
(a) Aquatic ecosystem
(b) ecosystem of a big tree
(c) grassland ecosystem
(d) tropical fresh ecosystem.
10. Gene therapy can be used to correct one of the following
(a) Defective ADA
(b) Lack of B-Lymphocytes
(c) Defective Immunoglobuline
(d) Lach of T-Lejmphocytes

National Council of Educational Research and Training (NCERT) 12th PCMB Model Question Paper