UPSC Geo-Scientist 2018 Chemistry Paper I Question Paper PDF

Central Government Jobs Other Jobs 2018

  • Year 2018
  • Conducted By UPSC
  • Maximum Marks 200
  • Duration Three Hours
  • Languages English

Exam Details

Detail Information
Examination Combined Geo-Scientist and Geologist Examination
Year 2018
Conducting Body UPSC
Paper CHEMISTRY Paper I
Subject Chemistry
Duration Three Hours
Maximum Marks 200
Question Type Mixed

This is the official question paper for the Combined Geo-Scientist and Geologist Examination 2018, specifically Chemistry Paper I, conducted by UPSC. The paper carries a maximum of 200 marks and allows three hours for completion. It is designed to assess candidates' in-depth knowledge of chemistry relevant to geological sciences. Aspirants can use this paper to understand the exam structure, question complexity, and key topics, aiding their preparation for the examination.

Major Topics Covered

  • Inorganic Chemistry
  • Coordination Compounds
  • Chemical Kinetics
  • Quantum Chemistry
  • Radioactivity
  • Atomic Radii
  • Electron Affinity
  • Acids and Bases
  • VSEPR Theory
  • Born-Haber Cycle
  • Molecular Orbital Theory

Why This Paper is Important

  • Useful for Combined Geo-Scientist and Geologist Exa 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

  • Combined Geo-Scientist 2017 Chemistry Paper I
  • Combined Geo-Scientist 2019 Chemistry Paper I
  • Geologist Examination 2018 Paper II
  • UPSC Chemistry Optional Paper
  • Combined Geo-Scientist 2018 Chemistry Paper I Answer Key
  • UPSC Geologist 2018 Chemistry Paper I Solutions
  • Combined Geo-Scientist Syllabus
  • UPSC Chemistry Syllabus

Instructions

  • भू-विज्ञान परीक्षा वियोज्य DETACHABLE GEOLOGIST EXAM-2018 CHEMISTRY Paper I Maximum Marks: 200

  • There are ELEVEN questions divided under SIX Sections.
  • Candidate has to attempt SIX questions in all.
  • The ONLY question in Section A is compulsory.
  • Out of the remaining TEN questions, the candidate has to attempt FIVE, choosing ONE from each of the other Sections B, C, D, E and F.
  • The number of marks carried by a question/part is indicated against it.
  • Attempts of questions shall be counted in sequential order.
  • Unless struck off, attempt of a question shall be counted even if attempted partly.
  • Answers must be written in ENGLISH only.
  • Neat sketches are to be drawn to illustrate answers, wherever required.
  • Unless otherwise mentioned, symbols and notations have their usual standard meanings.
  • Any page or portion of the page left blank in the Question-cum-Answer Booklet must be clearly struck off.

Questions (page 2)

Q1.

(f) What is 18-electron rule? Using the 18-electron rule predict the 'n' value for the following compounds :
(i) [u0006(C6H6) ext{Cr(CO)}_n]
(ii) [u0004(C4H4)_2 ext{ Mn}(Cl)(CO)_n]

(g) A wooden article of old age shows 40% as much ^{14}C activity as a fresh piece of wood. Calculate the age of the article. (t_{1/2} of ^{14}C = 5760 years)

(h) What is the usual order of preference of the alkali metal ions for a cation exchanging resin? Explain.

(i) Draw the structure of borazine. With the help of its reaction with HCl, explain why chemical properties of borazine are quite different from those of benzene.

(j) Atomic radii of two of the lanthanides are considerably higher than the other lanthanides. Identify those two lanthanides and explain the observation.

Section B

Q2. (Attempt any one question)

(a) Define the electron affinity. Explain the general trends of electron affinity in periodic table. Electron affinities of beryllium, magnesium, calcium and nitrogen are practically close to zero. Explain.

(b) Explain the basicities of the following acids and justify the answer by drawing the structures:
(i) Orthophosphoric acid
(ii) Pyrophosphoric acid
(iii) Metaphosphoric acid

(c) Write the product(s) formed from the following reactions :
(i) 3PCl3 + SO3 longrightarrow
(ii) HPO4 + H2O longrightarrow
(iii) TeO2 + 2SeF4 longrightarrow
(iv) 8HI + H2SO4 longrightarrow
(v) PCl5 + H2O longrightarrow

Section B

Q3.

(a) Write the important points of VSEPR theory. Draw the shape of the following molecules by using VSEPR theory :
(i) SF_{4}
(ii) XeOF_{4}
(iii) IF_{5}

(b) Draw the Born-Haber Cycle for the formation of NaCl crystal and write the two important uses of the Cycle.

(c) Draw the molecular orbital energy level diagrams for nitric oxide and carbon monoxide. Explain the magnetic behaviour of the molecules also.

Question paper preview

Scanned pages 1–2 for reference. Download the official PDF for the full paper.

Page 1
Combined Geo-Scientist and Geologist Examination 2018 Chemistry Paper I question paper page 1 instructions scan PDF download
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Combined Geo-Scientist and Geologist Examination 2018 Chemistry Paper I question paper page 1 instructions scan PDF download

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Frequently asked questions

What is the name of the examination?

The examination is the Combined Geo-Scientist and Geologist Examination.

Which year is this question paper from?

This question paper is from the year 2018.

Who conducts the Geo-Scientist and Geologist Examination?

The examination is conducted by UPSC (Union Public Service Commission).

What is the subject of this paper?

This paper is for Chemistry, specifically Paper I.

What is the maximum marks for this paper?

The maximum marks for this paper are 200.

What is the time allowed for this paper?

The time allowed for this paper is Three Hours.

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