This document contains an unsolved chemistry paper from 1982 containing multiple choice, true/false, and fill in the blank questions. The paper covers topics such as atomic structure, thermodynamics, organic chemistry compounds and reactions. It is divided into 4 sections with a total of 15 multiple choice, 10 true/false, and 10 fill in the blank questions requiring knowledge of fundamental chemistry concepts.

1. IIT JEE –Past papersCHEMISTRY- UNSOLVED PAPER - 1982

2. SECTION – ISingle Correct Answer TypeThis section contains 10 multiple choice questions. Each question has four choices (A), (B), (C) and (D) out of which ONLY ONE is correct.

3. 01ProblemHelium atom is two times heavier than a hydrogen molecule. At 298 K, the average kinetic energy of a helium atom is a. Two times that of a hydrogen molecule b. Same as that of a hydrogen moleculec. Four times that of a hydrogen moleculed. Half that of a hydrogen molecule

4. Problem02The element with the highest first ionization potential isa. Boron b. Carbonc. Nitrogend. Oxygen

5. Problem03The ion that is electronic with CO isa. CN-b. c. d.

6. Problem04Moderate electrical conductivity is shown bya. Silica b. Graphitec. Diamondd. Carborundum

7. Problem05Among the following, the molecule that is linear isa. CO2b. NO2c. SO2d. ClO2

8. Problem06The precipitate of CaF2 is obtained when equal volumes of the following are mixed a. b. c. d.

9. Problem07Iron is rendered passive by treatment with concentratedH2SO4H3PO4HClHNO3

10. Problem08In the metallurgy of iron, when limestone is added to the blast furnace, the calcium ion ends up in Slag GangueMetallic calciumCalcium carbonate

11. Problem09The ion that cannot be precipitated by both HCl and isa. b. c. d.

12. Problem10The oxidation number of carbon in is-2+20+4

13. Problem 11The compound with the highest boiling point isN-hexaneN-pentane 2, 2-dimethylpropane2-methylbutane

14. Problem 12The compound with no pole dipole moment isMethyl chloride Carbon tetrachloride Ethylene chloride Chloroform

15. Problem 13Among the following, the compound that can be most readily sulphonated is BenzeneNitrobenzeneTolueneChlorobenzene

16. Problem 14A compound that gives a positive iodoform test is1-pentanol2-pentanone3-pentanonePentanal

17. Problem 15The maximum number of isomers for an alkenes with the molecular formula is2345

18. SECTION – IIEach of which either True or FalseThis question contains four statements, each of which is either true or false. Indicate your choice of the answer in the answer-book by writing true or false for each statement.

19. 01ProblemThe outer electronic configuration of the ground state chromium atom is

20. Problem 02First law of thermodynamics is not adequate in predicating the direction of a process.

21. Problem03Red phosphorus is less volatile than white phosphorus because the former has a tetrahedral structure.

22. Problem04 on heating gives anhydrous .

23. Problem05Aluminum chloride is a Lewis acid because it can donate electrons.

24. Problem06When reacts with a dilute acid, it gives hydrogen peroxide.

25. Problem07Copper metal reduces in an acid medium.

26. Problem08Silver fluoride is fairly soluble in water.

27. Problem09Moist ethylene can be dried by passing it through concentrated sulphuric acid.

28. Problem10Benzaldehyde undergoes aldol condensation in an alkaline medium.

29. SECTION – IIIFill in the blanksRead the following statements carefully. Indicate the subdivision number and write the matter corresponding to the blanks strictly in the order they appear in the statement

30. 01ProblemThe energy released when an electron is added to a neutral gaseous atom is called ____________ of the atom.

31. Problem 02The mass of a hydrogen atom is _____________ kg.

32. Problem03When there are two electrons in the same orbital, they have _____________ spins.

33. Problem04There are _____________ bonds in a nitrogen molecule.

34. Problem05Isotopes of an element differ in the number of _____________ in their nuclei.

35. Problem06___________ Hybrid orbital of nitrogen atom are involved in the formation of ammonium ion.

36. Problem07The conjugate base of in aqueous solution is ______________.

37. Problem08An element undergoes an -emission by two successive -emission. The element formed is ___________ .

38. Problem09The increases in the solubility of iodine in an aqueous solution of potassium iodide is due to the formation of __________.

39. Problem10The compound prepared by the action magnesium on dry ethyl bromide in ether is known as ____________ reagent.

40. SECTION – IVMatch the followingchoosing one item from column X and one from column Y. In the box diagram below, the number of each item of column X is given. Write the number of the appropriate item from column Y against each of them.

41. 01Problem X Y I. Cassiterite II. N Lunar caustic III. Producer gas IV. Water softner V. KCl. Brown ring test VI. Carnallite VII. Calomel

42. 02Problem X Y I. Paralysis of alkane’s elimination reaction II. Benzene + chloromethane saponification (+ Anhydrous ) III. + NaOHWurtz reaction IV. Preparation of alkanesFriedel-Craft Reaction V. Phenol + (NaOH) Riemer-Tuemann Reaction VI. + alc.KOH cracking

43. 03Problem X Y Neutrons KohlraushMolecular speed van der Waals Intermolecular forces Maxwell Conductance of ions Chadwick.

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