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8/2/2019 JMS-2 PAPER -1

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JMS – 2 PAPER – 1

http://www.chemistrycrest.com/

PAPER-1Maximum Marks: 80

Question paper format and Marking scheme:

1. In Section I ( Total Marks: 21), for each question you will be awarded 3 marks if you darken ONLY thebubble corresponding to the correct answer and zero marks if no bubble is darkened. In all other cases,minus one (–1) mark will be awarded.

2. In Section II (Total Marks: 16), for each question you will be awarded 4 marks if you darken ALL thebubble(s) corresponding to the correct answer(s) ONLY and zero marks other wise. There are no negative

marks in this section.

3. In Section III (Total Marks: 15), for each question you will be awarded 3 marks if you darken ONLY the

bubble corresponding to the correct answer and zero marks if no bubble is darkened. In all other cases,minus one (–1) mark will be awarded.

4. In Section IV (Total Marks: 28), for each question you will be awarded 4 marks if you darken ONLY thebubble corresponding to the correct answer and zero marks otherwise. There are no negative marks in thissection.

8/2/2019 JMS-2 PAPER -1




SECTION – I (Total Marks : 21)

(Single Correct Answer Type)

This section contains 7 multiple choice questions. Each question has four choices (A), (B), (C) and (D) out of which ONLY ONE is correct.

1. For the reaction A+B ⇌2C, equal moles of A and B are placed in a container at 250C. At

equilibriium, it is found that concentration ratio of [C] to [A] is equal to 2, then value of ∆ G0 is

equal to(A) – 826.29 cal (B) -693.2 cal(C) 277.28 J (D) 596 J

2. Match the following.

Column-I Column-II

(a)XeF +H O

4 2Complete

hydrolysis

(P) HF

(b)XeF +H O

6 2Complete

hydrolysis

(Q) XeO3

(c) (R) SiF4

(d) (S) XeO F2 2

A) a - R ,S; b - P,S; c - Q; d -P,R B) a- P; b – R , S; c – Q ,S; d – Q ,PC) a- P,Q; b - P,Q; c – P ,S; d - R,SD) a - S; b - P,R; c – Q , R; d -P

3. An organic compound (X) with molecular formula C7H

8O is insoluble in aq NaHCO

3but dissolves

in NaOH. When treated with Bromine water, X rapidly gives Y, C7H

5OBr

3. The compounds

X and Y respectively are(A) Benzyl alcohol and 2,4,6 – Tribromo –3–methoxy phenol(B) o-Cresol and 3,4,5 – Tribromo –2 – methyl phenol(C) m– Cresol and 2,4,6 – tribromo – 3 – methyl phenol(D) Benzyl alcohol and 2,4,6 – tribromo – 3 – methyl phenol

4. The oxidative cleavage of Glucose (A) and Fructose (B) with 4HIO leads to the formation of acids,

aldehydes and also CO2. The ratio of no of moles of formic acid to formaldehyde formed in case of

(A) and (B) are respectively

a) 5:1 , 3:2 b) 5:2 , 3:1 c) 3:2 , 5:2 d) 4:2 , 5:1

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5.

( )

( )

1 NaOI ∆

A B+2 H → →

O

.Starting compound A is

A)

O

CH C OH2

− −

O

(B)

C OH−

O

O (C)

C CH3

−

O

O (D)

C CH3

−

O

O

6. An alkali metal hydride (NaH) reacts with diborane in Y to give a tetrahedral compound Z which

is extensively used as reducing agent in organic synthesis. Y and Z in the above reaction are

(A) C2H6, C2H5Na (B) C2H5–O–C2H5, NaBH4 (C) NH3, B3N3H6 (D) C3H8, C3H7Na

7. The following canonical structures follow the stability order

−+

= NN−

= NN⊕

NN ≡⊕Θ

I II III (A) I > II > III (B) III > I > II(C) II > III > I (D) II > I > III

SECTION – II (Total Marks : 16)

(Multiple Correct Answers Type)

This section contains 4 multiple choice questions. Each question has four choices (A), (B), (C) and (D) out of which ONE OR MORE may be correct.

8. Which of the following is/are correct for the characteristics indicated against each

(A) NH3 > PH3 > AsH3 > SbH3 (boiling point)(B) BF3 < BCl3 < BBr3 < BI3 (lewis acid strength) (C) H3PO2 > H3PO3 > H3PO4 (acidic strength) (D) HClO < HClO2 > HClO3 < HClO4 (acidic strength)

9. Which of the following statement(s) is/are correct (A) Cuprite and Zincite are oxide ores(B) Magnesite and carnallite are carbonate ores(C) Chalcocite and azurite are ores of copper(D) Felspar and mica contain aluminium.

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10. Which of the following is/are correct order with respect to the property mentioned.

(A) O22–

> O2 > O22+

[Paramagnetic moment](B) (NO)¯ > (NO) > (NO)+ [bond length](C) H2 > H2+ > He2+ [bond energy]

(D) NO2+ > NO2 > NO2¯ [bond angle]

11. Which of the following statement(s) is /are correct ?

(A)1

Ionisation energyscreening effect

∝

(B) The ionisation energies of Be and Mg are more than ionisation energy of B and Al respectively.(C) Atomic and ionic raddii of Nb and Ta are almost same

(D) Metallic and covalent radii of potassium are 2.3 Å and 2.03Å respectively.

SECTION-III (Total Marls : 15)(Paragraph Type)

This section contains 2 paragraphs. Based upon one of paragraphs 2 multiple choice questions andbased on the other paragraph 3 multiple choice questions have to be answered. Each of these questionshas four choices (A), (B), (C) and (D) out of which ONLY ONE is correct.

Paragraph for Question Nos. 12 and 13

Aqueous solution of ‘A’ White precipitate soluble in excess of NaOH ‘B’H SO

2 4↓ H O

2 2↓

White precipitate soluble in Brown precipitate ‘C’ammonium acetate ‘D’

.

Further,

aqueous solution of ‘A’ white precipitate soluble in NH3.

K Cr O2 2 7

HCl / H S2

Yellow ppt

Black ppt insoluble in NaOH

12. The complex “B” , which is soluble in excess of NaOH is(A) Na[Cu(OH)4] (B) Na2[Pb(OH)4](C) Bi(OH)3 (D) Na2SnO2

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13. Aqueous solution of ‘A’ on treatment with HCl / H2S gives a black ppt. Thus which of the cationic

species must not be present in compound ‘A’.(A) Hg2+ B) Pb+2 C) Cd2+ D) Bi3+

Paragraph for Question Nos. 14 to 16

Benzoic aicd, phenol, toluene and aniline were dissolved in dichloromethane . The solution was thentreated with 10% aq.HCl. After that, aqueous layer was collected in container I. Oily layer was furthertreated with 10% aq NaOH. This time aqueous layer was collected in container II and oily layer wascollected in container III.

14. Container I contains

(A) (B)

OH

(C) Both A and B (D)

NH2

15. Compound present in container II is

(A)

COOH

(B)

OH

(C) Both A and B (D)

NH2

16. Compound present in container III is

(A)

NH2

(B)

COOH

(C)

OH

(D)

CH3

8/2/2019 JMS-2 PAPER -1




SECTION-IV (Total Marks : 28)(Integer Answer Type)

This section contains 7 questions. The answer to each of the questions is a single digit integer, rangingfrom 0 to 9. The bubble corresponding to the correct is to be darkened in the ORS.

17. Among the following the total number of species which give two more than two types of acids on

addition of water is

NO2 , N2O, ClO2, NO, Cl2O6, P4O6, P4O10, Cl2.

18. 20% surface sites are occupied by N2

molecules. Number of surface sites per unit area is

6.023 × 1014 cm–2 and total area of catalyst surface is 1000 cm2 . When catalyst is heated to 300K

N2 gas is desorbed and evolved gas occupied, 2.46 cm3 at 0.001 atm. Find the no. of sites ocupied

by each molecule of N2.

19. Total number of structural and stereoisomers obtained from monochlorination of methyl

cyclohexane is

20. In case of [Cu(NH3)

4]

2+, 4p subshell contains ----------- unpaired e

-

21. 10 g of mixture of hexane and ethanol are allowed to react with sodium to give 214.2 mL hydrogenat 27

0C and 760 mm pressure. The percentage of ethanol in the mixture is

22 The number of –OH groups in the product obtained by reacting 3-methylbutane-1, 3-diol with

TsCl followed by NaBH4 is

23. A small piece of white phosphorus was reacted with excess Cl 2 gas to yield 68.75 grams of

phosphorus trichloride. No of discrete 4P molecules in the sample is (X.Y x 1022

) . X is

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