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VIVEKANANDA VIDHYALAYA HIGHER SECONDARY SCHOOL

ANTHIYUR, ERODE - 638501

HIGHER SECONDARY SECOND YEAR CHEMISTRY

MODEL QUARTERLY QUESTION PAPER 15 X 1 =15

I. Choose the correct Answer :

1. Extraction of gold and silver involves leaching with cyanide ion. silver is later recovered by

a) Distillation b) Zone Refining c) Displacement with zinc d) liquation

2. Metals having low melting points such as tin, lead, mercury and bismuth are refined by.........

process.

a) Distillation b) Liquation c) Electrolytic d) Zone refining

3. The compound that is used in nuclear reactors as protective shields and control rods is

a) metal borides b) metal oxides c) metal carbonates d) Metal carbide

4. which of the following does not give borax bead test?

a) Al2(SO4)3 b) Cu(NO3)2 c) NiSO4 d) (CH3COO)2O

5. Solid (A) reacts with strong aqueous NaOH liberating a foul smelling gas (B) which

spontaneously burn in air giving smoky rings. A and B are respectively.

a) P4 (red) and PH3 b) P4 (white) and PH3 c) S8 and H2S d) P4 (white) and H2S

6. which of the following is the correct order of increasing enthalpy of vaporization ?

a) NH3 < PH3 < AsH3 b) PH3 < AsH3 <NH3 c) AsH3< PH3 < NH3 d) NH3 < AsH3 < PH3

7. when a brown compound of Mn (A) is treated with HCl. it gives a gas (B). The gas (B) taken in

excess reacts with NH3 to give an explosive compound A,B and C are

a) MnO2, Cl2, NCl3 b) MnO2, Cl2, NH4Cl c) MnO2, Cl2, NCl3 d) MnO2, Cl2, NCl2

8. which element of actinoid show maximum number of oxidation state.

a) Th b) Pu c) Lr d) Am

9. A complex in which the oxidation number of the metal is zero is

a) K4[Fe(CN)6] b) Fe (CN3(NH3) c) [Fe(CO)5] d) both (b) and (c)

10. Match The Following

A) Wilkinsons catalyst (i) [TiCl4 + Al ( C2H5)3]

B) Ziegler - natta

catalyst (ii) [PPh3)3 RhCl]

C) Monds process (iii) Na2[Zn(CN)4]

D) Mac - arthur - forest

cyanide process (iv) [Ni (CO)4]

a) A - (i) , B - (ii) , C- (iii), D (iv) b) A - (iv) , B - (iii) , C- (ii), D (i)

c) A - (iii) , B - (i) , C- (ii), D (iv) d) A - (i) , B - (vi) , C- (iii), D (ii)

11. if 'a' is the length of the side of the cube, the distance between the body centered atom and

one corner atom in the cube will be

a) (2/√3) a b) (4/√3) a c) (√3/4) a d) (√3/2) a

12. The fraction of total volume occupied by the atoms in a simple cubic is

a) π /4 √2 b) π /6 c) ) π /4 d) π /2√2

13. The half life period of a radioactive element is 140 days. After 560 days , 1 g of element will

be reduced to

a) (1/2) g b) (1/4) g c) (1/8) g d) (1/16) g

14. The slope of the curve obtained by plotting log against 1/T for a chemical reaction is

TIME : 2.30 HRS

MARKS : 70

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a) -Ea/R b) R/Ea c) -Ea/2.303 d) e -Ea/RT

15. if the rate constant of a reaction is 0.0693 sec -1, the time for 99.9% completion of the

reaction is

a) 69.3 sec b) 0.693 sec c) 100 sec d) 10 sec

II. VERY SHORT ANSWERS QUESTION NO. 19 COMPULSORY 6 X 2 = 12

16. What is the role of Limestone in the extraction of Iron from its oxide Fe2O3?

17. What is inert pair effect?

18. Why are pentahalides more covalent than trihalides?

19. Give two examples for catalytic process.

20. [Co(NH3)4 Cl2]Cl, name the compound as IUPAC guidelines.

21. What are point defects?

22. Define rate law and rate constant

III. SHORT ANSWERS QUESTION NO. 27 COMPULSORY 6 X 3 = 18

23. Describe a method for refining a nickel.

24. Account for the fact that aluminum chloride exists as a dimer.

25. Give a reason to support that sulphuric acid is a dehydrating agent.

26. what are the inner transition element?

27. [CuCl4]

2- exists while [CuI4]

2- does not exist why?

28. Distinguish tetrahedral and Octahedral voids.

29. what is an elementary reaction? Give difference between order and molecularity of a

reaction.

IV. DETAILED ANSWERS ANY 5 5 X 5 = 25

30. i) Write a short note on electrochemical principle of metallurgy. (3M)

ii) Iodine in the refining of Zirconium (2M)

31. Describe in detail about preparation, properties and uses of Borax.

32. i) Explain the Manufacture of chlorine by electrolytic process and Deacons process (3M)

ii) What are interstitial compounds.

33. Apply the VB theory by the following compounds i). [Fe(CN)6]

3-

ii) [CoF6]

3-

34. Calculate the packing efficiency of body centered cubic arrangement?

35. Derive the integrated rate law for a first order reaction.

*******

F.RAJA M.Sc.,M.ED.,M.Phil.

PG CHEMISTRY

9442426054

VIVEKANANDA VIDHYALAYA

HIGHER SECONDARY SCHOOL

ANTHIYUR, ERODE - 638501

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