CS (MAIN) 2016 Chemistry Paper I Question Paper PDF

Central Government Jobs Other Jobs 2016

  • Year 2016
  • Conducted By UPSC
  • Questions 8
  • Maximum Marks 250
  • Duration Three Hours
  • Languages Hindi & English

Exam Details

Detail Information
Examination CS (MAIN) Exam
Year 2016
Conducting Body UPSC
Paper Chemistry Paper - I
Subject Chemistry
Duration Three Hours
Maximum Marks 250
Number of Questions 8
Question Type Mixed

This is the official Chemistry Paper I for the CS (MAIN) Exam conducted by UPSC in 2016. The paper is designed to test candidates' in-depth knowledge of Chemistry, with a total of 8 questions divided into two sections. Candidates are required to answer five questions in total, with compulsory questions 1 and 5, and at least one from each section. The exam allows three hours to complete and carries a maximum of 250 marks. This paper is crucial for aspirants aiming to qualify for the Civil Services Mains examination, providing insights into the expected question types and difficulty level.

Major Topics Covered

  • Chemistry
  • Bond Angles
  • Dipole Moments
  • Residual Entropy
  • Crystallography
  • Cubic Unit Cell
  • Continuity of State
  • Van der Waals Equation
  • Solubility Product
  • Ionic Conductance
  • Specific Conductance
  • Molecular Orbital Diagram
  • Isoelectronic Species
  • Bond Order
  • Absolute Reaction Rate Theory
  • Catalysis

Why This Paper is Important

  • Useful for CS (MAIN) Exam preparation
  • Helps understand the latest exam pattern
  • Useful for practice and self-assessment
  • Covers frequently asked General Studies topics
  • Helpful for analysing question trends

Related Resources

  • CS (MAIN) Exam 2016 General Studies Paper I
  • CS (MAIN) Exam 2016 General Studies Paper II
  • CS (MAIN) Exam 2016 Optional Subject Paper I
  • CS (MAIN) Exam 2016 Optional Subject Paper II
  • CS (MAIN) 2016 Chemistry Paper I Answer Key
  • CS (MAIN) Chemistry Syllabus
  • UPSC Mains Chemistry Syllabus
  • CS (MAIN) Exam Pattern

Instructions

  • पुस्तिका के मुख-पृष्ठ पर अंकित निर्दिष्ट स्थान पर किया जाना चाहिए।
  • उल्लिखित माध्यम के अतिरिक्त अन्य किसी माध्यम में लिखे गए उत्तर पर कोई अंक नहीं मिलेंगे।
  • जहाँ आवश्यक हो, निर्देशांक आरेखों को, प्रश्न का उत्तर देने के लिए दिए गए स्थान में ही बनाना है।
  • जब तक उल्लिखित न हो, संकेत तथा शब्दावली प्रचलित मानक अर्थों में प्रयुक्त हैं।
  • यदि आवश्यक हो, तो उपयुक्त आँकड़ों का चयन कीजिए तथा उनको निर्दिष्ट कीजिए ।
  • प्रश्नों के उत्तर निर्दिष्ट किये गये शब्द संख्या के अनुसार होना चाहिए ।
  • प्रश्नों के उत्तरों की गणना क्रमानुसार की जाएगी ।
  • यदि काटा नहीं हो, तो प्रश्न के उत्तर की गणना की जाएगी चाहे वह उत्तर अंशतः दिया गया हो ।
  • उत्तर-पुस्तिका में खाली छोड़ा हुआ पृष्ठ या उसके अंश को स्पष्ट रूप से काटा जाना चाहिए ।

  • There are EIGHT questions divided into TWO SECTIONS and printed both in HINDI and in ENGLISH.
  • Candidate has to attempt FIVE questions in all.
  • Question Nos. 1 and 5 are compulsory and out of the remaining, THREE are to be attempted choosing at least ONE from each Section.
  • The number of marks carried by a question/part is indicated against it.
  • Answers must be written in the medium authorized in the Admission Certificate which must be stated clearly on the cover of this Question-cum-Answer (QCA) Booklet in the space provided.
  • No marks will be given for answers written in a medium other than the authorized one.
  • Coordinate diagrams, wherever required, shall be drawn in the space provided for answering the question itself.
  • Unless otherwise mentioned, symbols and notations carry their usual standard meanings.
  • Assume suitable data, if considered necessary, and indicate the same clearly.
  • Word limit in questions, wherever specified, should be adhered to.
  • Attempts of questions shall be counted in sequential order.
  • Unless struck off, attempt of a question shall be counted even if attempted partly.
  • Any page or portion of the page left blank in the Question-cum-Answer Booklet must be clearly struck off. m-esc-u-chm

Questions (page 2)

Section A

Q1.

(a) (i) CH4, NH3 और H2O अणुओं के आबंधक कोण क्रमश: 109.5°, 107° व 104.5° होते हैं। व्याख्या कीजिए।

The bond angles in CH4, NH3 and H2O molecules are 109.5°, 107° and 104.5° respectively. Explain.

(a) (ii) BF3 और PF3 अणुओं के द्विध्रुव आघूर्ण पर अपने टिप्पण प्रस्तुत करें ।

Comment on the dipole moments of BF3 and PF3 molecules.

(b) अवशिष्ट एन्ट्रॉपी से आप क्या समझते हैं ? यहां तक कि कुछ पदार्थ जैसे CO व N2O, 0K पर भी अवशिष्ट एन्ट्रॉपी से संबद्ध क्यों रहते हैं ?

What is residual entropy? Why certain substances like CO and N2O are associated with residual entropy even at 0K?

(c) (i) क्रिस्टल विज्ञान में nlambda = 2d sin heta संबंध का परिणाम प्रस्तुत कीजिए ।

Derive the relation nlambda = 2d sin heta in crystallography.

(c) (ii) घन एकक सेल के स्तर (110) के बीच में अभिलंब दूरी क्या होगी ?

What is the perpendicular distance between (110) planes of a cubic unit cell ?

(d) CO2 के आइसोथर्मो की सहायता से अवस्था की अविच्छिन्नता को स्पष्ट कीजिए। वान्डर वाल्स समीकरण से इसकी कैसे संपुष्टि होगी ?

Explain "continuity of state" with the help of isotherms of CO2. How is it affirmed by van der Waals' equation?

(e) BaSO4 की विलेयता गुणनफल 1 imes10^{-10}~{
m md}^2,{
m dm}^{-6} है यदि Ba+2 की आयन चालकता अनंत तनुता तथा 25°C ताप पर 127.28 imes10^{-4}~{
m m}^2~{
m mho~mol}^{-1} और SO4-2 की 160.0 imes10^{-4}~{
m m}^2~{
m mho~mol}^{-1} हो तो BaSO4 की विशिष्ट चालकत्व का परिकलन कीजिए ।

The solubility product of BaSO4 is 1 imes 10^{-10} md2 dm-6. If the ionic conductance at infinite dilution at 25°C of Ba+2 = 127.28 imes 10^{-4} m2 mho mol-1 and SO4-2 = 160.0 imes 10^{-4} m2 mho mol-1, calculate the specific conductance of BaSO4.

Section A

Q2.

(a) (i) NO अणु का आण्विक कक्षीय आरेख बनाइए। सिद्ध कीजिए कि NO+, CN- व CO समइलेक्ट्रोनी हैं और NO का आबन्ध क्रम NO+ से कम है ।

Draw the molecular orbital diagram of NO molecule. Show that NO+, CN- and CO are isoelectronic, and the bond order of NO is lower than that of NO+.

(a) (ii) निरपेक्ष अभिक्रिया दर सिद्धान्त की विवेचना कीजिए। उत्प्रेरक अभिक्रिया को किस प्रकार तेज कर देता है ?

Discuss the theory of absolute reaction rate. How does a catalyst make reaction faster?

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Frequently asked questions

What is the name of the exam for which this paper is?

This paper is for the CS (MAIN) Exam.

Which year is this CS (MAIN) exam paper from?

This question paper is from the year 2016.

Who conducts the CS (MAIN) Exam?

The CS (MAIN) Exam is conducted by UPSC.

What is the subject of this paper?

The subject of this paper is Chemistry, specifically Paper I.

What is the maximum marks for this Chemistry Paper I?

The maximum marks for Chemistry Paper I is 250.

What is the time allowed to complete this paper?

The time allowed to complete this paper is Three Hours.

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