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#### Model Question Paper Part IV

11th Standard

Reg.No. :
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Chemistry

Time : 02:30:00 Hrs
Total Marks : 100

Part I

Choose the most suitable answer from the given four alternatives and write the option code with the corresponding answer.

15 x 1 = 15
1. Equivalent mass of KMnO4 in acidic medium, concentrated alkaline medium and dilute basic medium respectively are $M\over5$ , M, M. Reduced products can be:

(a)

Mn02, MnO42-, Mn2+

(b)

Mn02, Mn2+,MnO42-

(c)

Mn2+,Mn02,MnO42-

(d)

Mn2+,MnO42-,Mn02

2. Which of the following pairs of d-orbitals will have electron density along the axes ?

(a)

dz2, dxz

(b)

dxz, dyZ

(c)

dz2, dx2-y2

(d)

dxy ,dx2-y2

3. Gadolinium belong to '4f series.Its atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?

(a)

[Xe]4f95s1

(b)

[Xe]4f75d16s2

(c)

[Xe]4f65d26s2

(d)

[Xe]4f8d2

4. Water is a

(a)

basic oxide

(b)

acidic oxide

(c)

amphoteric oxide

(d)

none of these

5. Which of the following are stored under oil?

(a)

Alkali metals

(b)

Coinage metals

(c)

Noble metals

(d)

Phosphorous

6. Match the list - I with List - II and select the correct answer using the code given below the lists.

 List-I List-II A. $\frac { { r }_{ 1 } }{ { r }_{ 2 } } =\sqrt { \frac { { M }_{ 2 } }{ { M }_{ 1 } } }$ 1. Boyle's law B. PV = constant 2. Graham's law C. $\frac { V }{ T } =constant$ 3. Ideal gas D. PV=nRt 4. Charle's law
(a)
 A B C D 1 2 3 4
(b)
 A B C D 4 3 2 1
(c)
 A B C D 2 1 4 3
(d)
 A B C D 1 3 4 2
7. Heat of combustion is always

(a)

positive

(b)

negative

(c)

zero

(d)

either positive or negative

8. The values of KP1 and KP2 for the reactions
X ⇌ Y + Z
A ⇌ 2B are in the ratio 9: 1 if degree of dissociation and initial concentration of X and A be equal then total pressure at equilibrium P1 and P2 are in the ratio

(a)

36: 1

(b)

1: 1

(c)

3: 1

(d)

1: 9

9. The Van't Hoff factor (i) for a dilute aqueous solution of the strong elecrolyte barium hydroxide is

(a)

0

(b)

1

(c)

2

(d)

3

10. Which one of the following has linear shape?

(a)

I3-

(b)

ICI4-

(c)

BrF5

(d)

IOF5

11. In an organic compound, phosphorus is estimated as

(a)

Mg2P2O7

(b)

Mg3(PO4)2

(c)

H3PO4

(d)

P2O5

12. Which one of the following electrophile used for nitration of benzene?

(a)

Br

(b)

NO2

(c)

-NH2

(d)

NOӨ

13. C- C- C bond angle in benzene is

(a)

120°

(b)

60°

(c)

45°

(d)

135°

14. Which one following mechanism will be followed when Tartiary butyl chloride is treated with alcoholic KOH?

(a)

SN1 mechanism

(b)

E1 mechanism

(c)

SN2 mechanism

(d)

E2 mechanism

15. Assertion (A): Excessive use of chlorinated pesticide causes soil and water pollution.
Reason (R) : Such pesticides are non-biodegradable.

(a)

Both (A) and R are correct and (R) is the correct explanation of (A)

(b)

Both (A) and R are correct and (R) is not the correct explanation of (A)

(c)

Both (A) and R are not correct

(d)

(A) is correct but( R) is not correct

16. Part II

Answer any 6 questions. Question no. 24 is compulsory.

6 x 2 = 12
17. What will be the mass of one 12C atom in g?

18. How many orbitals are possible for n =4?

19. How is plaster of paris prepared?

20. Give an expression for the rates of diffusion of two different gases and their molecular weighs.

21. The equilibrium constant for the reaction is 10. Calculate the value of $\Delta { G }^{ \ominus }$;  Given R = 8.314 JK-1 mol-1; T = 300 K.

22. What is the effect of added inert gas on the reaction at equilibrium.

23. What is meant by metallic bond?

24. Give a brief description of the principles of
i) Fractional distillation
ii) Column Chromatography.

25. In an experiment ethyliodide in ether is allowed to stand over magnesium pieces. Magnesium dissolves and product is formed
a) Name the product and write the equation for the reaction.
b) Why all the reagents used in the reaction should be dry? Explain
c) How is acetone prepared from the product obtained in the experiment.

26. Part III

Answer any 6 questions. Question no. 33 is compulsory.

6 x 3 = 18
27. Define stoichiometry.

28. State and explain pauli's exclusion principle

29. In what period and group will an element with Z = 118 will be present?

30. How is temporary hardness removed?

31. Which would you expect to have a higher melting point magnesium oxide or magnesium fluoride? Explain your reasoning.

32. Explain graphical representation of Gay Lussac's law.

33. Cyanamide (NH2CN) is completely burnt in excess oxygen in a bomb calorimeter, ΔU was found to be -742.4 kJ mol-1calculate the enthalpy change of the reaction at 298K. NH2CN(S) +$\frac{3}{2}$O2(g)⟶ N2(g)+ CO2(g)+ H2O(I) ΔH= ?

34. 2.82 g of glucose is dissolved in 30 g of water. Calculate the mole fraction of glucose and water.

35. Which of the following compounds will not exist as resonance hybrid? Give reason for your answer.
(i) CH3 - OH
(ii) R-CONH2
(iii) CH3-CH = CH-CH2NH2

36. Part IV

5 x 5 = 25
37. Balance the following equation by oxidation number method.
KMnO4 + HCI $\rightarrow$ KCl + MnCl2 + H2O + Cl2

38. By applying Bohr's postulates, arrive at the radius of nth orbit for hydrogen like atom

39. Explain about the general characteristics of periods.

40. Explain preparation of hydrogen using electrolysis.

41. List out the uses of alkali metals

42. The boiling point of water at a pressure of 50 atm is 538 K. Compare the theoretical efficiencies of a steam engine operating between the boiling point of water at
(i) 1atm pressure
(ii) 50 atm pressure, assuming the temperature of the sink to be 350°C in each case.

43. Write a detailed account on the postulates of MOT.

44. Give IUPAC names for the following compounds
1) CH3 – CH = CH – CH = CH – C ≡ C – CH3
2)
3) (CH3)3 C – C ≡ C – CH (CH3)2
4) ethyl isopropyl acetylene
5) CH ≡ C – C ≡ C – C ≡ CH

45. Explain the mechanism involved in bimolecular nucleophilic substitution reaction.

46. Mention the standards prescribed by BIS for quality of drinking water