chemistry

CODE: KAARTHEEKA HYD SBD ZONE / JR IIT REG (IIT-69-BITS-MODEL) / 03-11-08 / FILE NO. IIT – 172 /17(01/11/2008)

CHEMISTRYSection – A [47- 52]

[This section contains 6 multiple choice questions numbered 47 to 52. Each question has 4 choices (a),(b),(c) and (d),out of which ONLY ONE is correct. For each question you will be awarded 3 marks if you have darkened only the bubble corresponding to the correct answer and zero mark if no bubble is darkened. In all other cases, minus one (-1) mark will be awarded ]

47. Metalic sodium dissolves in liquid ammonia to form a deep blue coloured solution which is due to the formation of a) Solvated electron

b)

c)

d) Solvated atomic sodium,

48. When borax is heated strongly it givesa) B2O3 b) Na2B4O7 c) BaBO2 d) NaBO2 and B2O3

49. Boron reacts with NaOH to form a) Boric acid b) Borates c) Boric anhydrided) None of these

50. Plaster of Paris hardens by a) Giving off CO2 b) Changing into CaCO3

c) Combining with water d) Giving out water 51. In solvay ammonia process, sodium bicarbonate will not be precipitated

a) Presence of NH3 b) Reaction with CO2

c) Reaction with brine solution d) Reaction with NaOH52. The sealed containers of same capacity and at the same temperature are filled with 44g of H2 in

one and 44g of CO2 in the other. If the pressure of CO2 in the second container is 1 atm, that of hydrogen in the first container would be a) 1 atm b) 10 atm c) 22 atm d) 44 atm

SECTION-B [53-56][Section II contains 4 multiple correct answer type questions. Each question has 4 choices 1), 2), 3) and 4), out of which one or more answers are correct. For each question in Section –II , you will be awarded 4 marks if you have darkened only the bubble corresponding to the correct answer and zero marks if no bubble is darkened. In all other cases, no negative marking for wrong answer.]

53. Mark the correct statements in the following.In diborane (B2H6) a) Each B atom undergoes sp3 hybridisation b) There is tetrahedra environment around each B atomc) Hb …… B…… Hb bond angle is 970

d) There are four hydrogen bridge bonds54. Magnesium burns in the atmosphere of which of the following gases ?

a) CO2 b) N2O c) N2 d) SO2

55. The pairs of compounds which cannot exist together in aqueous solution area) NaH2PO4 and Na2HPO4 b) Na2CO3 and NaHCO3

c) NaOH and NaH2PO4 d) NaHCO3 and NaOH56. Which of the following will not liberate hydrogen

a) Zn + H2SO4 (dil) b) Mg + HNO3 (dil)c) Al2O3 + NaOH d) Cu + H2SO4 (conc)


Section – C (57 – 60)[This section contains 4 question numbered 57 to 60 Each question contains STATEMENT-1 (Assertion) and STATEMENT-2( Reason) Each question has 4 choices (a), (b), c) and (d) out of which ONLY ONE is correct. For each question you will be awarded 3 marks if you have marked only the bubble corresponding to the correct answer and zero mark if no bubble is darkend. In all other cases, minus one (-1) mark will be awarded.]

a) Both A and R are true and R is the correct explanation of A b) Both A and R are true but R is not the correct explanation of A c) A is true , R is falsed)A is false R is true

ASSERTION & REASON

57. Assertion : Setting of cement is endothermic process Reason : It involves dehydration of calcium aluminates and calcium silicates

58. Assertion : The compound called inorganic benzene is borazine Reason : Borazine has structural similarity with benzene.

59. Assertion : Sulphate is estimated as BaSO4 and not as MgSO4

Reason : Ionic radius of Mg2+ is smaller than that of Ba2+

60. Assertion : Magnesium is extracted by the electrolysis of fused mixture of MgCl2, NaCl and CaCl2Reason : Calcium chloride acts as a reducing agent.

Section –DLinked Comprehension Type

[The section contains 3 paragraphs , and . Based upon each paragraph, 3 multiple-choice questions have to be answered. Each question has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct For each question you will be awarded 4 marks if you darken only the bubble corresponding to the correct answer and zero mark if no bubble is darkened. In all other cases, minus one (-1) mark will be awarded.]

PASSAGE-I

Metallic nitrate (A) on heating decomposes leaving a solid residue (B) which goes into solution with dilute HCl. The solution of (B) gives a white precipitate with ammonium carbonate solution. The solution (B) with dilute H2SO4 also gives a white precipitate (D) insoluble in dilute HCl and nitric acid. The precipitate (D) is a part of a white pigment lithopone.

61. The compound (D) is a) BaSO4 b) MgSO4 c) CaSO4 d) Na2SO4

62. The metal nitrate (A) is a) Ca(NO3)2 b) Pb(NO3)2 c) Ba(NO3)2 d) KNO3

63. The solid residue (B) is a) CaO b) PbO c) ZnO d) BaO


PASSAGE-IIAlkali and alkaline earth metals along with Hydrogen and Helium constitute s - Block elements.

They have low ionization enthalpies and hence exhibit characteristic flame colurations. They have highly negative electrode potentials and hence are strong reducing agents. Their solutions in liquid ammonia are conducting and also act as strong reducing agents. Being stronger reducing agents than hydrogen, they are usually prepared by electrolysis of their fused chlorides. Their oxides are basic and basic strength increases down the group. The solubility of carbonates and sulphates of alkali and alkaline earth metals show opposite trends. The carbonates of alkaline earth metals and lithium carbonate decompose on heating while the carbonates of other alkali metals donot decompose on heating. The bicarbonates of both alkali and alkaline earth metals on heating give carbonates.

64. The basic character of the oxides MgO, SrO, K2O, NiO and Cs2O increases in the order. a) MgO > SrO > K2O > NiO > Cs2O b) Cs2O < K2O < MgO < SrO < NiOc) NiO < MgO < SrO < K2O < CS2O d) K2O < NiO < MgO < SrO < Cs2O

65. Which of the following are arranged in increasing order of solubilities a) CaCO3 > KHCO3 < NaHCO3 b) NaHCO3 < KHCO3 < CaCO3

c) KHCO3 < NaHCO3 < CaCO3 d) CaCO3 < NaHCO3 < KHCO3

66. Identify the correct order of acidic strengths of CO2, CuO, CaO, H2Oa) CaO < CuO < H2O < CO2 b) H2O < CuO < CaO < CO2

c) CaO < H2O < CuO < CO2 d) H2O < CO2 < CaO < CuO

PASSAGE-III

A compound (X) white crystalline reacts with water to produce an alkaline solution. On heating it produces a transparent bead which on heating with CuSO4 form a blue colour bead Y. Compound X on heating with ethanol and H2SO4 give green edged flame. Compound X dissolves in NaOH but when conc. H2SO4 is added white crystals of an acid (Z) separate out.

67. The compound X is a) Na2 [B4O5 (OH)4]. 8H2O b) NaBO2

c) Na2[B4O7(OH)8] d) H3BO3

68. The green edged flame is because of a) vapours of ethanol b) vapours of sulphuric acid c) vapours of triethyl borate d) vapours of boron trisulphate

69. The compound Z is a) Na2B4O7 b) H3BO3 c) Na2SO4 d) NaB(SO4)2

PAPER SETTER HYD – SBD

MATHS: SRI CHANDRA MOULI: 9912343512

PHYSICS: SRI RAMAKRISHNA: 9441945154

CHEMSITRY: MEENAKSHI : 9441443422,27823737


DISCUSSION PARTICIPANT BRANCHES TPT & HYD – KPIC

chemistry

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