This document contains an unsolved chemistry practice test from 2004 with 50 multiple choice questions covering various topics in chemistry including quantum numbers, atomic structure, chemical bonding, acid-base reactions, solutions, equilibrium, electrochemistry, and coordination compounds. The questions require selecting the best answer from four choices given for each problem.
iPositive Academy offers the best NEET Coaching. Score 600+ in NEET entrance exam with training from us. We are the best in NEET UG Coaching Coimbatore http://ipositiveacademy.com/
iPositive Academy offers the best NEET Coaching. Score 600+ in NEET entrance exam with training from us. We are the best in NEET UG Coaching Coimbatore http://ipositiveacademy.com/
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
Palestine last event orientationfvgnh .pptxRaedMohamed3
An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
Introduction to AI for Nonprofits with Tapp NetworkTechSoup
Dive into the world of AI! Experts Jon Hill and Tareq Monaur will guide you through AI's role in enhancing nonprofit websites and basic marketing strategies, making it easy to understand and apply.
Embracing GenAI - A Strategic ImperativePeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
2. SECTION – A Single Correct Answer Type There are five parts in this question. Four choices are given for each part and one of them is correct. Indicate you choice of the correct answer for each part in your answer-book by writing the letter (a), (b), (c) or (d) whichever is appropriate
3. 01 Problem Which of the following sets of quantum numbers is correct for an electron in 4f orbital ? n = 4, l = 3, m = + 4, s = + 1/2 n = 4, l = 4, m = - 4, s = - 1/2 n = 4, l = 3, m = + 1, s = + 1/2 n = 3, l = 2, m = -2, s = + ½
4. Problem 02 Consider the ground state of Cr atom (Z = 24). The numbers of electrons with the azimuthally quantum numbers, l = 1 and 2 are, respectively : 12 and 4 12 and 5 16 and 4 16 and 5
5. Problem 03 Which one of the following ions has the highest value of ionic radius ? Li+ B3+ O2- F-
6. Problem 04 The wavelength of the radiation emitted when in a hydrogen atom electron falls from infinity to stationary state 1, would be (Rydberg constant = 1.097 x 107 m-1) : 91 mm 192 mm 406 nm 9.1 x 10-8 nm
7. Problem 05 The correct order of bond angles (smallest first) in H2S, NH3, BF3 and SiH4 is : H2S < SiH4 < NH3 < BF3 NH3 < H2S < SiH4 < BF3 H2S < NH3 < SiH4 < BF3 H2S < NH3 < BF3 < SiH4
8. Problem 06 Which one of the following sets of ions represents the collection of isoelectromic species K+, Ca2+, Sc3+, Cl- Na+, Ca2+, Sc3+, F- K+, Cl-, Mg2+, Sc3+ Na+, Mg2+, Al3+, Cl- (Atomic numbers F = 9, Cl = 17, Na = 11, Mg = 12, Al = 13, K = 19, Ca = 20, Sc = 21)
9. Problem 07 Among Al2O3, SiO2, P2O3 and SO2 the correct order of acid strength is : SO2 < P2O3 < SiO2 < Al2O3 SiO2 < SO2 < Al2O3 < P2O3 Al2O3 < SiO2 < SO2 < P2O3 Al2O3 < SiO2 < P2O3 < SO2
10. Problem 08 The bond order in NO is 2.5 while that in NO+ is 3. Which of the following statements is true for these two species ? Bond length in NO+ is greater than in NO Bond length in NO is greater than in NO+ Bond length in NO+ is equal to that in NO Bond length is unpredictable
11. Problem 09 The formation of the oxide ion O2- (g) requires first an exothermic and then an endothermic step as shown below. O(g) + e- = O-(g) ; ∆H0 = - 142 kJmol-1 O(g)- + e- = O2-(g) ; ∆H0 = 844 kJ mol-1 This is because : Oxygen is more electronegative Oxygen has high electron affinity O- ion will tend to resist the addition of another electron O- ion has comparatively larger size than oxygen atom
12. Problem 10 The sates of hybridization of boron and oxygen atoms in boric acid (H3BO3) are respectively : sp2 and sp2 sp2 and sp3 sp3 and sp2 sp3 and sp3
13. Problem 11 Which one of the following has the regular tetrahedral structure ? XeF4 SF4 BF [Ni(CN)4]2- (Atomic numbers B = 5, S = 16, Ni = 28, Xe = 54)
14. Problem 12 Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them ? (n - 1)d8 ns2 (n - 1)d5 ns1 (n - 1)d3 ns2 (n - 1)d5 ns2
15. Problem 13 As the temperature is raised from 200C to 400C the average kinetic energy of neon atoms changes by a factor of which of the following ? a. ½ b. c. 313/293 d. 2
16. Problem 14 The maximum number of 900 angles between bond pair-bond pair of electrons is observed in : dsp3 hybridization sp3d hybridization dsp2 hybridization sp3d2 hybridization
17. Problem 15 Which one of the following aqueous solutions will exhibit highest boiling point ? 0.01 M Na2SO4 0.01 M KNO3 0.015 M urea 0.015 M glucose
18. Problem 16 Which among the following factors is the most important in making fluorine the strongest oxidizing agent ? Electron affinity Ionization enthalpy Hydration enthalpy Bond dissociation energy
19. Problem 17 In van der Waals equation of state of the gas law, the constant ‘b’ is a measure of: Intermolecular repulsions Intermolecular attraction Volume occupied by the molecules Intermolecular collisions per unit volume
20. Problem 18 The conjugate base of H2PO is : PO43- P2O5 H3PO4 HPO42-
21. Problem 19 6.02 x 1020 molecules of urea are present in 100 mL of its solution. The concentration of urea solution is : 0.001 M 0.01 M 0.02 M 0.1 M (Avogadro constant, NA = 6.02 x 1023 mol-1)
22. Problem 20 To neutralize completely 20 mL of 0.1 M aqueous solution of phosphorous acid (H3PO3), the volume of 0.1 M aqueous KOH solution required is : 10 mL 20 mL 40 mL 60 mL
23. Problem 21 For which of the following parameters the structural isomers C2H5OH and CH3OCH3 would be expected to have the same values ? (Assume ideal behaviour) : Heat of vaporization Vapour pressure at the same temperature Boiling points Gaseous densities at the same temperatures and pressure
24. Problem 22 Which of the following liquid pairs shows a positive deviation from Raoult’s law ? Water - hydrochloric acid Benzene - methanol Water - nitric acid Acetone - chloroform
25. Problem 23 Which one of the following statements is false ? Raoult’s law states that the vapour pressure of a component over a solution is proportional to its mole fraction The osmotic pressure ( ) of a solution is given by the equation = MRT, where M is the molarity of the solution The correct order of osmotic pressure for 0.01 M aqueous solution of each compound is BaCl2 > KCl > CH3COOH > sucrose Two sucrose solutions of same molality prepared in different solvents will have the same freezing point depression
26. Problem 24 What type of crystal defect is indicated in the diagram below ? Na+, Cl-, Na+, Cl-, Na+, Cl- Frenkel defect Schottky defect Interstitial defect Frenkel and Schottky defects
27. Problem 25 An ideal gas expands in volume from 1 x 10-3 to 1 x 10-2 m3 at 300 K against a constant pressure of 1 x 105 Nm-2. The work done is : - 900 J - 900 kJ 270 kJ 900 kJ
28. Problem 26 In hydrogen-oxygen fuel cell, combustion of hydrogen occurs to : Generate heat Create potential difference between the two electrodes Produce high purity water Remove adosred oxygen from electrode surfaces
29. Problem 27 In a first order reaction, the concentration the reactant, decreases frm 0.8 M to 0.4 M in 15 minutes. The time taken for the concentration to change from 0.1 M to 0.025 M is : 30 min 15 min 7.5 min 60 min
30. Problem 28 What is the equilibrium expression for the reaction P4(s) + 5O2(g) P4O10(s) ? a. b. c. KC = [O2]5 d.
31. Problem 29 For the reaction, CO(g) + Cl2 (g) COCl2(g), the Kp/Kc is equal to: a.1/RT b. RT c. d. 1.0
32. Problem 30 The equilibrium constant for the reactions N2(g) + O2 (g) 2NO(g) at temperature T is 4 x 10-4. The value Kc for the reaction : at the same temperature is : 2.5 x 102 50 4 x 10-4 0.02
33. Problem 31 The rate equation for the reaction 2A + B-> C is fond to be : are = k [A] [B]. The correct statement in relation to this reaction is that the : Unit of k must be s-1 t1/2 is a constant rate of formation of C is twice the rate of disappearance of A value of k is independent of the initial concentrations of A and B
34. Problem 32 Consider the following E0 values : Eo Fe3+/Fe2+ = +0.77V EoSn2+/Sn = -0.14 V Under standard conditions the potential for the reaction Sn(s) + 2Fe3+(aq) 2Fe2+ (aq) + Sn2+ (aq) is : 1.68 V 1.40 V 0.91 V 0.63 V
35. Problem 33 The molar solubility(in mol L-1) of a sparingly soluble salt MX4 is ‘s’ the corresponding solubility product is Ksp. s is given in terms of Ksp by the relation : s = (Ksp/128)1/4 s = (128 Ksp)1/4 s = (256 Ksp)1/5 s = (Ksp/256)1/5
36. Problem 34 The standard e.m.f. of a cell, involving one electron change is found to be 0.591 V at 250C. The equilibrium constant of the reaction is (F = 96,500 C mol-1, R = 8.314 JK-1 mol-1) : 1.0 x 101 1.0 x 105 1.0 x 1010 1.0 x 1030
37. Problem 35 The enthalpies of combustion of carbon and carbon monoxide are -393.5 and -283 kJ mol-1 respectively. The enthalpy of formation of carbon monoxide per mole is 110.5 kJ -110.5 kJ -676.5 kJ 676.5 kJ
38. Problem 36 The limiting molar conductivities ^0 for NaCl, KBr and KCl are 126, 152 and 150 S cm2 mol-1 respectively. The ^0 for NaBr is : 128 S cm2 mol-1 176 S cm2 mol-1 278 S cm2 mol-1 302 S cm2 mol-1
39. Problem 37 In a cell that utilizes the reaction Zn(s) + 2H (aq) -> Zn2+ (aq) + H2 (g) addition of H2SO4 to cathode compartment, will : Lower the E and shift equilibrium to the left Lower the E and shift the equilibrium to the right Increase the E and shift the equilibrium to the right Increase the E and shift the equilibrium to the left
40. Problem 38 Which one of the following statements regarding helium is incorrect ? It is used to fill gas balloons instead of hydrogen because it is lighter and non-inflammable It is used as a cryogenic agent for carrying out experiments at low temperatures It is used to produce and sustain powerful superconducting magnets It is used in gas-cooled nuclear reactors
41. Problem 39 Identify the correct statement regarding enzymes : Enzymes are specific biological catalysts that can normally function at very high temperatures (T ~ 1000 K). Enzymes are normally heterogeneous catalysts that are very specific in their action Enzymes are specific biological catalysts that cannot be poisoned Enzymes are specific biological catalysts that possess well defined active sites.
42. Problem 40 One mole of magnesium nitride on the reaction with an excess of water gives: One mole of ammonia One mole of nitric acid Two moles of ammonia Two moles of nitric acid
43. Problem 41 Which one of the following ores is best concentrated by froth-floatation method ? Magnetite Cassiterite Galena Malachite
44. Problem 42 Beryllium and aluminum exhibit many properties which are similar. But, the two elements differ in : Exhibiting maximum covalency in compounds Forming polymeric hydrides Forming covalent halides Exhibiting amphoteric nature in their oxides
45. Problem 43 Aluminum chloride exists as dimmer, Al2Cl6 in solid state as well as in solution of non-polar solvents such as benzene, when dissolved in water, it gives : Al3+ + 3Cl- [Al(H2O)6]3+ + 3Cl- [Al(OH)6]3- + 3HCl Al2O3 + 6HCl
46. Problem 44 The soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. White metallic tin buttons got converted to grey powder. This transformation is related to : A change in the crystalline structure of tin An interaction with nitrogen of the air at very low temperatures A change in the partial pressure of oxygen in the air An interaction with water vapour contained in the humid air
47. Problem 45 The values for Cr, Mn, Fe and Co are -0.41, + 157, + 0.77 and + 1.97 V respectively. For which one of these metals the change in oxidation state from + 2 to + 3 is easiest ? Cr Mn Fe Co
48. Problem 46 Excess of KI reacts with CuSO4 solution and the Na2S2O3 solution is added to it. Which of the statements is incorrect for this reaction ? Cu2I2 is formed CuI2 is formed Na2S2O3 is oxidized Evolved I2 is reduced
49. Problem 47 Among the properties (A) reducing (B) oxidizing (C) complexing, the set of properties shown by CN- ion towards metal species is : A, B B, C C, A A, B, C
50. Problem 48 The co-ordination number of a central metal atom in a complex is determined by The number of ligands around a metal ion bonded by sigma bonds The number of ligands around a metal ion bounded by pi-bonds The number of ligands around a metal ion bounded by sigma and pi-bonds both The number of only anionic ligands bonded to the metal ion
51. Problem 49 Which one of the following complexes is an outer orbital complex ? [Fe(CN)6]4- [Mn(CN)6]4- [Co(NH3)6]3+ [Ni(NH3)6]2+ (Atomic numbers Mn = 25, Fe = 36, Co = 27, Ni = 28)
52. Problem 50 Co-ordination compounds have great importance in biological systems. In this context which of the following statements is incorrect ? Chlorophylls are green pigments in plants and contain calcium Haemoglobin is the red pigment of blood and contains iron Cyanocobalamin is vitamin B12 and contains cobalt Carboxypeptidase-A is an enzyme and contains zinc
53. Problem 51 Cerkum (Z = 58) is an important member of the lanthanoids. Which of the following statements about cerium is incorrect ? The common oxidation states of cerium are + 3 and + 4 The + 3 oxidation state of cerium is more stable than the + 4 oxidation state The + 4 oxidation state of cerium is not known in solutions Cerium (IV) acts as an oxidizing agent
54. Problem 52 Which one of the following has largest number of isomers ? [Ru (NH3)4 Cl2]+ [Co (NH3)5Cl]2+ [Ir(PR3)2 H(CO)]2+ [Co(en)2Cl2]+ (R = alkyl group, en = ethylenediamine)
55. Problem 53 The correct order of magnetic moments (spin only values in B.M.) among the following is [MnCl4]2- > [CoCl4]2- > [Fe(CN6)]4- [MnCl4]2-> [Fe(CN6)]4-> [CoCl4]2- Fe(CN6)]4- > [MnCl4]2- > [CoCl4]2- [Fe(CN6)]4-> [CoCl4]2-> [MnCl4]2- (Atomic numbers Mn = 25, Fe = 26, Co = 27)
56. Problem 54 Consider the following nuclear reactions : The number of neutrons in he element L is : 142 144 140 146
57. Problem 55 The half-life of a radioisotope is four hours. If the initial mass of the isotope was 200 g. The mass remaining after 24 hours undecided is : 1.042 g 2.084 g 3.125 g 4.167 g
58. Problem 56 The compound formed in the positive test for nitrogen with the Lasaigne solution of an organic compound is : Fe4[Fe(CN)6]3 Na3[Fe(CN)6] Fe[Fe(CN)]3 Na4[Fe(CN)6NOS]
59. Problem 57 The ammonia evolved from the treatment of 0.30 g of an organic compound of the estimation of nitrogen was passed in 100 mL, of 0.1 M sulphuric acid. The excess of acid required 20 mL of 0.5 M sodium hydroxide solution of complete neutralization. The organic compound is : Acetamide Benzamide Urea Thiourea
60. Problem 58 Which one of the following has the minimum boiling point ? n-butane 1-butyne 1-butene Isobutene
61. Problem 59 The IUPAC name of the compound 3,3-dimethyl-1-hydroxy cyclohexane 1,1-dimethyl-3-hydroxy cyclohexane 3,3-dimethyl-1-cyclohexanol 1,1-dimethyl-3-cyclohexanol
62. Problem 60 Which one of the following does not have sp2hybridised carbon ? Acetone Acetic acid Acetonitrile Acetamide
63. Problem 61 Which of the following will have a meso-isomer also ? 2-chlorobutane 2,3-dichlorobutane 2, 3-dichloropentane 2- hydroxypropanoic acid
64. Problem 62 Rate of the reaction Is fastest when Z is : Cl NH2 OC2H5 OCOCH3
65. Problem 63 Amongst the following compounds, the optically active alkane having lowest molecular mass is :
66. Problem 64 Consider the acidity of the carboxylic acids: PhCOOH o-NO2C6H4COOH p-NO2C6H4COOH m-NO2C6H4COOH
68. Problem 66 Which base is present in RNA but not in DNA ? Uracil Cytosine Guanine Thymine
69. Problem 67 The compound formed on heating chlorobenzene with chloral in the presence of concentrated sulphuric acid is : Gammexene DDT Freon Hexachloroethane
70. Problem 68 On mixing ethyl acetate with aqueous sodium chloride, the composition of the resultant solution is : CH3COOC2H5 + NaCl CH3COONa + C2H5OH CH3COCl + C2H5OH + NaOH CH3Cl + C2H5COONa
71. Problem 69 Acetyl bromide reacts with excess of CH3MgI followed by treatment with a saturated solution of NH4Cl gives : Acetone Acetamide 2-methyl-2-propanol Acetyl iodide
72. Problem 70 Which one of the following is reduced with zinc and hydrochloric acid to give the corresponding hydrocarbon ? Ethyl acetate Acetic acid Acetamide Butan-2-one
73. Problem 71 Which one of the following undergoes reaction with 50% sodium hydroxide solution to give the corresponding alcohol and acid ? Phenol Benzaldehyde Butananl Benzoic acid
74. Problem 72 Among the following compounds which can be dehydrated very easily ?
75. Problem 73 Which of the following compounds is not chiral ? 1-chloropentane 2-chloropentane 1-chloro-2-methyl pentane 3-chloro-2-mehtyl pentane
76. Problem 74 Insulin production and its action in human body are responsible for the level of diabetes this compound belongs to which of the following categories ? A co-enzyme Ahormone An enzyme An antibiotic
77. Problem 75 The smog is essentially caused by the presence of : O2 and O3 O2 and N2 Oxides of sulphur and nitrogen O3 and N2