JMS – I PAPER - 1 http://www.chemistrycrest.com/Page 1 PAPER -1 Maximum Marks: 80Question 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 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. 2. In Section II (Total Marks: 16), for each question you will be awarded 4 marks if you darken ALL the bubble(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 the bubble corresponding to the correct answer and zero marks otherwise. There are no negative marks in this section.
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1. In Section I ( Total Marks: 21), 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.
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 this
6. Assertion : The radii of noble gases are larger than that of the radii of precedent halogens.Reason : Radii of Noble gases are measured as van der waal’s radii as they do not form
covalent bonds like halogens and rcovalent < rvan der waal’s.
(A) Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
(B) Both Assertion and Reason are true but Reason is not correct explanation of Assertion.
(C) Assertion is true but Reason is false
(D) Assertion is false but Reason is true
Sol. (A)
Being monoatomic, noble gases have very large values of non-bonded radii.So, radii of noblegases should be compared not with the covalent radii but with the van der Waals radii of other
elements.
7. Arrange the following in the decreasing order of their acidic nature
1) 4–Nitro benzoic acid
2) 4–Nitro phenol
3) 4–Methoxy benzoic acid
4) p–CresolA) 1 > 2 > 4 > 3 B) 3 > 1 > 2 > 4
C) 1 > 3 > 2 > 4 D) 3 > 2 > 1 > 4
Sol. (C)
Greater the acid dissociation constant( Ka) or lesser the PKa , greater is the acidic nature
Pka values of the given compounds ( For comparison sake)
3.4 ( - NO2 is strong –I & strong – M effecting group)
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 questions
has four choices (A), (B), (C) and (D) out of which ONLY ONE is correct.
Paragraph for Question Nos. 12 and 13
A metal complex having ( )Cr NH Cl Br3 24
has been isolated in two forms (A) and (B). The
form A reacts with AgNO3 to give a white precipitate readily soluble in dilute aqueous
ammonia , whereas B gives a pale yellow precipitate soluble in concentrated ammonia.