Download 1. Explain electrophile and nucleophile. 2. Explain

Model Paper Class XI
CHEMISTRY
Questions:1. Explain electrophile and nucleophile.
2. Explain (a) Carbocations and (b) Carboanions.
3. Explain (a) Distillation under reduced pressure (b) Steam
Distillation.
4. 0.0196gm of an organic substance on combination gave 0.22g
of CO2 and 0.0675g of H2O.In Carius determination 0.3925g of
the substance gave 0.717g of dry AgCl.Find percentage
composition of the substance.
5. Name the isotopes of Hydrogen and also write their symbols.
6. What causes the temporary and permanent hardness of water?
7. Explain electron deficient compounds. Explain it with some
examples.
8. Explain hydroformylation of olefins to aldehydes or it is called
ox process.
9. Give examples of electron rich molecular hydride.
10. Write the method of manufacturing of ammonia.
11. Draw structure of diborane.
12. What is the Oxidation No. of underlined atoms in the
following?
a. K2Cr_O7
b. P_O43-
c. H2SO4
13. Why sodium metal is kept under Kerosene.
14.BeCl2 can be easily hydrolyzed explain.
15. What is ortho and para Hydrogen.
16. What makes water hard? How is the permanent hardness of
H2O removed by Calogen method?
17. What is producer gas? Why it is used as an industrial fuel?
18. Complete the following reactions.
a.Mg3N2 + 6H2O
b.HNO3 + P4O10
c.BCl3 + H2O
d.NaBH4 + I2
e.P4 + HNO3
19. How would you explain lower atomic radius of Ga as
compared to Al?
20. Give reason
A.Alumunium Alloys are used to make aircraft body.
B.Conc.HNO3 can be transported in Aluminum Chamber.
c. Diamond is used as an abrasive.
21. A. Explain Le Chote Lier’s principle.
B.Describe the effect of 2H2 +CO
(i) Addition of (H2)
CH3OH
(ii) addition of CH3OH
(iii) Removal of CO
(iv) Removal of CH3OH on the equilibrium of the reaction
2H2+CO (9)
CH3OH (9)
22. Balance this reaction by Ion-electron method:a.MnO4-(aq) +I- (aq)
MnO2 + I2 (g)(in basic
medium)
b.Cr2O72-(aq) + Fe2+ (aq)
Cr3+(aq) + Fe3+(aq)
medium)
(acidic
c.MnO4-(aq)+H2C2O4(aq)
Mn2+(aq)+CO2+H2O(I)
(acidic medium)
d. P(s)+OH-(aq)
medium)
PH3(9)H2PO2-aq) (basic
23. What is redox-couple?
24. What do you understand by?
a. Inert gas effect b.allotrophy c.Banana bond
25. What happens when?
a. Borax is heated strongly
b.BF9 reacted with NH3
2-
26. [SiF6] are known where as [SiCl6]2- not give reason.
b.Select the members of gp-14 that
i.forms most acidic oxide
ii.is commonly found in +2 oxidation state.
iii.as semi conductor.
27. Explain the following reaction:i. Silicon is heated with methyl chloride at high temperature in the
presence of copper.
ii.Silicon is heated with methyl hydrogen fluoride.
28. Define disproportionate reaction with example.
29. What is meant by hybridization? Describe the shape of
Sp3hybrid orbital.
30. How atomic hydrogen is used for cutting and welding
purpose?
31. Classify the following as covalent ionic or polymeric interstitial
Hydride.
BeH2
GeH
CaH2
TiH2
RbH
32. What is inorganic Benzene? Explain it briefly.
33. Explain Zeolites and Glass.
34. Is boric acid is a protonic acid? Explain.
35. BCl3 is more stable than TlCl3.Why?
36. Comment on Lewis acid strength of Boron halides.
37. When an alkali metal dissolves in liquid ammonia the solutions
can acquire different colours.Explain the reasons for this type of colour
change.
38. The solubility product of AgCl is 1.5*10-10.Predict whether
there will be any precipitation by mixing some of 0.01M NaCl and 50 ml
of 0.01 M AgNO3 solution.
39. Explain the effect of temperature on the DG.
40. Derive relationship between Cp and Cv.
41. Explain the construction and working of Bomb Calorimeter.
42. A system absorbs 52kj heat from a heat reservoir and 74 KJ
work is done on it by the surroundings. What is the change in
internal energy of the system?
43. Explain the relationship between DH and DU.
44. Calculate
ru
for the reaction:
CH4(g)+2O2(g)
CO2(g) + 2H2O(l) at 298 K if
rH IS -890.35KJ at the same temperature.
45. Explain Hess’s law of constant heat summation.
46. With the help of thermo chemical equation given below
determine
rH AT 298 K for the following reaction.
C (graphite) + O2(g)
H2(g) + ½ O2(g)
CO 2(g)
H2(l)
r=393.5KJmol-1
rH®=285.8KJ/mol
CO2(g) + 2H2O(l)
CH4+2O2
rH®= +890.3KJ/mol
47. Distinguish between intensive and extensive prosperities.
48. Explain London forces and Keesomes forces.
49.A Sample of gas at 0° C occupies a volume of 21 at a pressure
of 650 Torr.Calculate its volume at normal atmospheric pressure
the temperature remaining constant.(1 atm=760Torr)
50.A sample of gas at 1.20 atm.pressure and 27°Cis heated at
constant pressure to 57°C.Its final volume is 4.75L.Calculate its
original volume.
51. What will be volume of a gas at 273K and 1 atm which
occupied 4.6 litre volume at 542 atm and 232K?
52. Derive ideal gas equation PV=nRT
53. The reaction 25O2(g)+O2(g)
25O3 was started by taking one
mole each of SO2(g) and O2 in a vessel of 5.00dm3.
54. At 450K Kp=2.0*1010/bar for the given reaction mixture
contained 0.85 moles of SO3(g).What is Kc at this temperature?
55. Why are pure liquids and solids usually ignored while writing
the equilibrium constant expression explain?
56. Explain the buffer solution?
57. The ionization constant of nitrous acid is 4.5*10-4.Calculate the
pH of 0.04M.Sodium nitrate solution and also is degree of
hydrolysis:
58. Explain Molar heat capacity.
59. Derive first law of thermodynamic.
60. What are the factors on which the equilibrium constant
depends?
61. Explain Dalton’s law of partial pressure.
62. Predict if the solutions of the following salts are neutaliacidic
or basic NaCl, KBr,NaCN,NH4NO3,NaNO2 and KF.
63. Calculate Ka for an acid HA if degree of ionization is 0.012 in to
1.0M solution.
64. Explain common ion effect with one example.
65. Write conjugate acid or base or base for the following species.
a.CH3COO-
b.HNO2
c.S2-
d.HClO3
66. Identify the functional groups in the following compounds
(a)
CHO
OMe
OCH2CHN(C2H5)2
OH
O
68 Why alkyl groups act as donors when attached to a π System?
69. Draw the resonance structures for the following compounds. Show
the electron shift using curved arrow rotation.
(i) C6H5OH (2) C6H5NO2 (3) C6H5C+H2 (4) CH3CH=CHCHO (5)
CH3CH=CHC+H2
(6)C6H5CHO
(7) CH2=CHOCH3.
70. Write chemical equations describing the acid catalyzed dehydration
of ethanol.
71. What is Baeyer’s reagent? For what purpose it is used?
72. Reductive ozonolysis of alkenes give ethanol and propanone.Name
the compound and write its structure.
73. Explain acidic nature of alkynes?
74. Differentiate between ethane, ethene and ethyne.
75. How can benzene be prepared starting from benzene diazonium
chloride.
76. Describe Friedel Craft’s reaction.
77. Why are O- and P- directing groups called activating groups, where
as m-directing groups deactivating groups?