sir gm dahri

Pro. G.M Dahri 2014

1. At STP 0.5 mole of gas occupies volume of…………

a.22.4dm3 b.89.6dm3 c. 11.2dm3 d.44.8dm3

2. The voilet of visible spectra has shortest wavelength of a bout………..

a.4000A’ b. 7000’ c. 1000’ d. 2000

3. IF n=4 and l=3 it represent

a. s orbit b. p orbit c. d orbit d. f orbit.

4. For the reaction 2NO + O2-----------> 2NO , the order of reaction is..

a. 1st order b. 2nd order c. 3rd order d. zero order e. fraction order

5. which of the following has highest degree of polorizing in its molecule?

a. HBr b. HI c. HCl d HF

6. which of the following particle would on losing an half filled set of p-orbital

a. C b. N c. N- d. O+ e. O-

7. which of the following gas has same rate of diffusion at STP?

a. H2 and Ne b. O2 & CO c. CO2 d. CO2 & SO2

8. Viscosity depends upon…………

a. Temperature b. Size molecule c. Shape of molecule d. Intermolecular force e. A.O.T

9. The solution of Log(a/b)

a. loga+logb b. log a-logb c. log(a)b d. b loga

10. PV=nRT is invalid for

a. Real gas b. Ideal gas c. lighter gas d. heavier

11. Methyl orange is often used as………..

a. Strong base and weak acid b. strong acid and weak base.

c. strong base and strong acid d. weak acid and weak base.

12. The reaction Cl2 + 2e------- > 2Cl- is

a. Redox reaction b. Oxidation c. Reduction d. addition

13. in 80 gram of NaOH , there are

a. 2 moles of NaOH b. 1 mole of NaOH c. 3 moles of NaOH 4. 0.5 mole of NaOH

14. x-rays are a. fast mocing electron b. proton c. neutron d. positively charged helium nuclei

15. The number of atoms in 9.2gm Na will be…..

a. 6.02 exp 23 atoms b. 2.408 exp 23 atoms c. 9.2 exp 23 atoms d. 23 atoms e. 9.2 atoms

16. PV=K represents a. Boyle’s Law b. Avagadro’s Law c. Charles Law d. Graham’s Law

17. what value does 400 cm3 of sample if gas at 700torr occupies when the pressure is changed to 2 atm

a. 140000cm3 b. 184cm3 c. 0.0184cm3 d. 140cm3 e. 0.00184 cm3

18. In going from 1s2,2s2, 2p6, 3s2, 3p6, 4s1 to 1s2,2s2, 2p6, 3s2, 3p5, 4s2 an electron would

By. Teerath kumar Menghwar

Pro. G.M Dahri 2014

a. absorb energy b. emit energy c. Relax to the ground state c. bind to another atom

19. the latent heat of fusion is defined as……

a. the heat energy required to change 1mg of a solid into liquid at its M.P

b. the heat energy required to change 1kg of a solid into liquid at its M.P

c. the heat energy required to change 1g of a solid into liquid at its M.P

d. the heat energy required to change 18g of a solid into liquid at its M.P

20. which orbit has lowest energy?

a. 3d b. 4s c. 3p d. 5f

21. Molecular orbital picture of 2 indicate

a. one unpaired electron b. two unpaired electron c. three upaired electron d. n.o.t

22. Absolute temperature of a gas is double and pressure is reached to one half the volume would be.

a. remain same b. increase by four c. decrease by four.

23. if pH of solution is 7 then it represents….

a. Acidic solution b. Basic solution c. Point of Neutrality d. Molar solution

24. which of following factors has no effect on boiling point.?

a. pressure b. intermolecular force c. amount of liquid d. n. o.t

25. Buffer solution is used to …..

a. increase the acidity b. decrease the acidity c. maintain pH d. increase basicity

26. Oxidation number of all elements in free state is…………..

a. Negative b. positive c. zero d. -1 3. -2

27. The reaction H2+I2<-------- > 2HI is independent of……

a. temperature b. concentration c. Catalyst d. pressure e. Reactant

28. Bond energy of molecule depends upon

a. Bond distance & polarity b. Ionization energy c. internal energy d. lattice energy

29. Hyberdization b/w C-C in acetylene C2H2 is……..

a. sp3- sp3 b. sp2-sp2 c. sp-sp d. sp2-sp e. sp2-s

30. H3PO4 dissolve in water and ionizes as follows

a. H3PO4 < ---------------- > 3H+ + PO43- b. . H3PO4 < ---------------- > 5H+ + PO4

3-

c. . H3PO4 < ---------------- > 4H+ + PO43- d. . H3PO4 < ---------------- > 3H+ + PO4

3-

31. In an atom no two electron can have the same set of four quantum number. This is statement of the …..

a. Hesinberg uncertainty principle b. Pauli exclusion principle

c. Aufbau principle c. Hund’s Rule

32. Complete the following equation


Pro. G.M Dahri 2014

Be9+ He4 --------- > ? + n1 0

a. C120 b. N14 7 c. C12

6 d. O 168

33. 1s2,2s2, 2p6, 3s2, 3p5 is an electronic configuration of …….

a. Na b. K c. Cl d. F e. S

34. The geometry of BF3 is…………….

a. Tetra hydral b. Linear c. Octahydral d. planar trigonal e. Squar planar.

35. the average rate of reaction can be expressed as……..

a. concen: of reaction (-) minus concentration of product.

b. concen: of reaction and product and multiplied by the time required for the reaction

c. change in conc: of product or reactant divided by time.

36. The amount of heat at constant volume is equal to…..

a. change in internal energy b, change in enthalpy c. ideal gas constant d. P delta V e. Pressure

37. In Boyle’s law if the volume of gas is plotted verses reciprocal of pressure the curve is obtained is…

a. parabola b. Hyperbola c. straight line d. symbolic e. a.o.t

38. which of the following has longest wavelength….

a. violet b. blue c. red d. green

39. Shape of orbital indicate by symbol is called……... quantum no.

a. principle b. angular c. magnetic d. spin e. n.o.t

40. Covalent compound are………..

a. crystal are made of ions b. insoluble in organic compound c. are soluble in water d. are non electrolyte.

41. which the following is planar trigonal molecule a. HCl b. BeCl2 c. BF3 d. CO2 e. CS2

42. If system absorb energy the sign delta H is a. +ve b. –ve c. neither of them d. continuously changed change in property of system is equal to value of property final state minus initial state

43. The rate at which substance react is directly proportional to active mass of reactant

a. Boyle’s law b. Law of mass action c. Charles law d. Avagardo’s Law e. Doltan’s Law

44. PCl5 < ---------- > PCl3 + Cl2 The number of moles of Cl2 produced will be………..?if one mole of PCl5 is heated at 250’c Kc= 0.041

a. 0.041 b. 0.465 c. 4.65mole b. 4.1 mole

45. The end point of an acid base titration Is often detected be means of an………….

a. Catalyst b. Flame c. pH oaoer d. Litmus paper d. indicator

46. The pH of 0.004 mol/dm3 of HCl (fully dissolved) at 25’c will be……

a. 4 exp -3 b. 1 c. 24 d. 2.40 e.

47. H2 + I2 < ------------- > 2HI there will be no effect on equilibrium if….

a. Temperature is lowered b.conc: of reactant is increased

c. pressure is lowered, temperature is raised d. conc: of product increase.

48. For the reaction A ------------ > B the threshold energy of reaction is 51KJ/mole. The average internal energy of A is 27KJ/mole calculate activition energy……………..

a. 30KJ/mol b. 19KJ/mol c. 24KJ/mol d. 37KJ/mol e. 30Kg/mol


Pro. G.M Dahri 2014

49. The conductance of electric currect through solution…………….

a. increase with dilution b. Increase with icnrease concentration

c. Increase with decrease of absolute velocities d. increase by decreasing temperature by 1’c

e. increase with large increase in pressure.

50. Indicators are complex molecule that themselves are………..

a. strong acid b. strong base c. weak acid d. weak base e.both C & D

51. For reaction A ----------------- > B. The threshold energy of reaction is 50KJ/mol. The average internal energy of A is 25KJ/mol. The activition energy of A is………..

a. 25KJ/mol b. 50KJ/mol c. 100KJ/mol d. 125KJ/mol e. 0 KJ/mol

52. The reaction 2H2O2---MnO2--- > 2H2O + O2 MnO2 is a……………..

a. +ve catalyst b. _-ve catalyst c. Autocatalyst d. Bio-catalyst

53. Which of following has same E.F and M.F?

a. CH4 b. H2O c. NaCl d. MgO e. A.O.T

54. Ideal gas equation is obtained by combining….

a. Boyle’s law, doltan’s law & charles law b. Boyle’s law, charles law & Avagdro’s law

c. Doltan’s law, Charle’s law & Avogdro’s law d. A.O.T

55. The S.F for 1.41 X 3.546 is……….

a. 15.10 b. 5.00 c. 8.00 d. 6.50 e.10.00

56. which of the following bonds explain water high boiling point.

a. ionic bonding b. covalent bonding c. polar covalent d. mattlic bonding e. hydrogen bonding

57. The bodn bond angle for linear, trigonal and tetra hydral shape respective are.

a. 180, 120, 109 b. 130,180,129 c. 180,109, 120 d. 129, 180, 160

58. The heat evolved or absorbed during chemical reaction depends upon the……..

a. the amount of chemical substance b. the physical state of substance involved c. the temperature d. whether reaction occurs at constant pressure or constant volume e. n.o.t

59. If volume of gas is plotted against the total pressure the curve obtained would be……

a. straight line b. parabole c. hyperbola d. exponential e. n.o.t

60. Absolue temperature is equal to a. -237.16’C b. -273.16K c. -273.16’C d. -272’C e. 0’C

61.The compressibility factor of an ideal gas is

a. 0 b. 2 c. 4 d.1

62. What is mass of 1.5 mole of oxygen molecule?

a. 16g b. 48g c. 8g d. 32g

63. which of the following has more viscosity?

a. heptane b. Ether c. Benzene d. Water

64. substance showing variable intensity of the property in different direction is called..

a. anisotropy b. isotropy c. allotropy d. symmetry

65. which orbital have low energy

a. filled b. un-hybrid c. hybrud c. atomic


Pro. G.M Dahri 2014

66. which radiation are of very high frequancy

a. I.R b, X-ray c. Visible rays d. U.C

67. Poise is equal to……….

a. 1000Kgm-1sec-1 b. 100 Kgm-1sec-1 c. 10 Kgm-1sec-1 d. 0.1 Kgm-1sec-1

68. Isomorphic substance have same

a. B.P b. M.P c. atomic point d. lattice point

69. In a process 200J of heat is absorbed by a system while 200J work done by system. The change in internal energy a. 200J b. 50J c. 100J d. 300J

70. Moelcular orbital of lower energy then atomic orbital is called………….

a. Bonding orbital b. antibonding orbital c. Atomic orbital d. Non-bonding orbital

71. A sample of gas occupies 50dm3 at S.T.P assuming constant pressure what volume will the gas occupy if temp is double……

a. 25dm3 b. 50dm3 c, 200dm3 d. 2500dm3

72. Example of trigonal system is.. a. BaSO4 b. AgNO3 c. ZnSO4 d. SiO2 e. SnO2

73. Four container of equal volume are filled as follows I. 2gm of H2 at 0’C II. 1g of H2 at 273’c

III. 24gm of O2 at 0’C IV. 16gm CH4 Which container is at greatest pressure.?

a. I b. II c. III d. IV

74. All of the following are non polar bond except. a. Cl2 b. O2 c. N2 d. HF e. H2

75. water has maximum density at temperature of..? a. –4’C b. 4’C c. -20’C d. 100’C e. 10’C

76. Phenol phthalein is an indicator used for a. strong acid & weak base b. stong base & weak acid

c. Strong acid & strong base d. weak acid & weak base.

77. which of the following will be the most electrically conductive….

a. sugar dissolved in water b. salt water c. salt dissolved in an organic compound

d. an oil & water mixture

78. which of the following is an element

a. tap water b. graphite c. sea water d. Brass e. Sulphuric acid.

79. To what volume must 10.0mL of 5.00M HCl be diluted to make a 0.5M HCl solution…..

a. 1 mL b. 50mL c. 100mL d. 500mL e. 1000mL

80. The property being able to add enthalpies is based on the

a. law of conservation of heat b. first law of thermodynamics c. law of constant composition d.E=mc2

e. Hess’s Law

81. If delta H of a reaction is -100Kcal/mol it indicates the reaction…

a. Endothermic b. exothermic c. unstable d. in need of catalyst e. N.O.T

82. Which of the following is most likely to increase the rate of a reaction

a. decreasing the temperature b. reducing the surface area of reactant

c. decreasing the concentration of reactant in the reaction vessel d. reducing activation energy

e. -ve catalyst.


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