UPSC Civil Services Main Chemistry Paper I 2019 Question Paper PDF

Central Government Jobs Other Jobs 2019

  • Year 2019
  • Conducted By UPSC
  • Questions 8
  • Maximum Marks 250
  • Duration Three Hours
  • Languages English & Hindi

Exam Details

Detail Information
Examination UPSC Civil Services Main Examination
Year 2019
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 question paper for the UPSC Civil Services Main Examination held in 2019. 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 questions 1 and 5 being compulsory. The exam duration is three hours, and it carries a maximum of 250 marks. This paper is crucial for aspirants aiming to secure a position in the Civil Services, providing a clear understanding of the examination's scope and difficulty.

Major Topics Covered

  • Chemistry
  • Chemical Bonding
  • Lattice Energies
  • Nomenclature of Complexes
  • Van der Waals Equation
  • Heisenberg Uncertainty Principle

Why This Paper is Important

  • Useful for UPSC Civil Services Main Examination 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

  • UPSC Civil Services Main Examination 2019 General Studies Paper I
  • UPSC Civil Services Main Examination 2019 General Studies Paper II
  • UPSC Civil Services Main Examination 2019 Essay Paper
  • UPSC Civil Services Main 2019 Chemistry Paper I Answer Key
  • UPSC Civil Services Main Chemistry Syllabus
  • UPSC Civil Services Main Exam Pattern
  • UPSC Civil Services Preliminary Examination
  • UPSC Engineering Services Examination

Instructions

  • पुस्तिका के मुखपृष्ठ पर अंकित निर्दिष्ट स्थान पर किया जाना चाहिए ।
  • उल्लिखित माध्यम के अतिरिक्त अन्य किसी माध्यम में लिखें 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 in 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.
  • Constants: Faraday: 96,500 Coulomb R = 0.0832 l atm mol-1 k-1 (8.314 J K-1 mol-1) h = 6.627 \times 10^{-34}Js -1

Questions (page 2)

Section A

Q1.

(a) निम्नलिखित यौगिकों में किस यौगिक में आबंध अपेक्षाकृत अधिक सहसंयोजक गुण का होगा :
(a) NaBr या (b) MgBr2 ?
कारणों सहित उत्तर दें।
In which of the following compounds do the bonds have greater covalent character :
(a) NaBr or (b) MgBr2?
Give reasons to support your answer.

(a) निम्नलिखित यौगिकों को उनकी प्रत्याशित जालक ऊर्जाओं के क्रमानुसार लिखिये :
LiCl, KCl, KBr, MgBr2
अपने उत्तर के समर्थन के लिए कारण प्रस्तुत कीजिए ।
Order the following compounds according to their expected lattice energies :
LiCl, KCl, KBr, MgBr2.
Give reasons to support your answer.

(b) संकुलों के संरूपीय समावयवों के नामकरण की किन्हीं तीन पद्धतियों का वर्णन कीजिए।
Describe any three systems of nomenclature of conformational isomers of complexes.

(c) वान डर वाल्स समीकरण दर्शाता है कि left(P + raca{overlineV2}
ight)(overlineV-b) = RT (a व b स्थिरांक हैं)
वान डर वाल गैस के लिए left(racpartial upartial v
ight)_T मालूम कीजिए ।
van der Waals' equation states that left(P + raca{overlineV2}
ight)(overlineV - b) = RT (a and b are constants).
Find left(racpartial upartial v
ight)_T for van der Waals' gas.

(d) हाइजेनबर्ग अनिश्चितता सिद्धांत का उपयोग करते हुए, एक मधुमक्खी की स्थिति की अनिश्चितता (मीटरों में) का परिकलन कीजिए । मधुमक्खी का वजन 0.68 g है और उसका वेग 0.85 m/s है। यह मान लिजिए की वेग में अनिश्चितता 0.1 m/s है।
Use the Heisenberg uncertainty principle to calculate the uncertainty (in metres) in the position of a honeybee weighing 0.68 g and travelling at a velocity of 0.85 m/s. Assume that the uncertainty in the velocity is 0.1 m/s.

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UPSC Civil Services Main Chemistry Paper I 2019 question paper page 1 instructions scan PDF download. Official UPSC Civil Services Main Chemistry Paper I 2019 question paper page 1 instructions and exam header.
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UPSC Civil Services Main Chemistry Paper I 2019 question paper page 1 instructions scan PDF download. Official UPSC Civil Services Main Chemistry Paper I 2019 question paper page 1 instructions and exam header.

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Frequently asked questions

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

This is the Chemistry Paper I for the UPSC Civil Services Main Examination.

What is the year of this question paper?

This question paper is from the year 2019.

Who conducts the Civil Services Main Examination?

The Civil Services Main Examination is conducted by the UPSC (Union Public Service Commission).

What is the maximum marks for Chemistry Paper I?

The maximum marks for Chemistry Paper I is 250.

What is the time allowed for this paper?

The time allowed for Chemistry Paper I is three hours.

How many questions are there in total?

There are a total of eight questions in this paper.

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