UPSC Combined Geo-Scientist 2023 Chemistry Paper II PDF

Central Government Jobs Other Jobs 2023

  • Year 2023
  • Conducted By UPSC
  • Questions 120
  • Maximum Marks 300
  • Duration Two Hours
  • Languages English

Exam Details

Detail Information
Examination Combined Geo-Scientist (Preliminary) Examination
Year 2023
Conducting Body UPSC
Paper Paper-II Chemistry
Subject Chemistry
Duration Two Hours
Maximum Marks 300
Number of Questions 120
Question Type Objective (MCQ)

This is the official question paper for the UPSC Combined Geo-Scientist (Preliminary) Examination 2023, Paper II, focusing on Chemistry. The exam is conducted by the Union Public Service Commission (UPSC) and allows candidates two hours to answer 120 objective-type questions, with a maximum of 300 marks. This paper is crucial for aspirants aiming to qualify for the Geo-Scientist posts, providing a direct resource to understand the exam's difficulty level, question types, and syllabus coverage. Practicing with this paper helps candidates identify their strengths and weaknesses, refine their preparation strategy, and improve their performance in the actual examination.

Major Topics Covered

  • Chemistry
  • Radial Distribution Function
  • Atomic Orbitals (2s, 2p)
  • Wave Functions
  • Quantum Numbers
  • Nodes
  • Electronic Configuration
  • Atomic Number
  • Noble Gases
  • Periodic Table
  • Atomic Radii
  • D-block Elements
  • Unpaired Electrons
  • Ionization

Why This Paper is Important

  • Useful for Combined Geo-Scientist (Preliminary) 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 (Preliminary) Examination 2022 Chemistry Paper II
  • Combined Geo-Scientist (Main) Examination Chemistry Paper
  • UPSC IES 2023 Mechanical Engineering Paper I
  • GATE 2023 Chemistry Previous Year Paper
  • Combined Geo-Scientist (Preliminary) Examination 2023 Chemistry Answer Key
  • UPSC Geo-Scientist 2023 Paper II Solutions
  • Combined Geo-Scientist (Preliminary) Examination Syllabus
  • UPSC Chemistry Syllabus for Competitive Exams

Instructions

  • THIS TEST BOOKLET DOES NOT HAVE ANY UNPRINTED OR TORN OR MISSING PAGES OR ITEMS, ETC.
  • IF SO, GET IT REPLACED BY A COMPLETE TEST BOOKLET.
  • Please note that it is the candidate's responsibility to encode and fill in the Roll Number and Test Booklet Series Code A, B, C or D carefully and without any omission or discrepancy at the appropriate places in the OMR Answer Sheet.
  • Any omission/discrepancy will render the Answer Sheet liable for rejection.
  • You have to enter your Roll Number on the
  • Test Booklet in the Box provided alongside. DO NOT write anything else on the Test Booklet.
  • This Test Booklet contains 120 items (questions).
  • Each item comprises four responses (answers).
  • You will select the response which you want to mark on the Answer Sheet.
  • In case you feel that there is more than one correct response, mark the response which you consider the best.
  • In any case, choose ONLY ONE response for each item.
  • You have to mark all your responses ONLY on the separate Answer Sheet provided.
  • Before you proceed to mark in the Answer Sheet the response to various items in the Test Booklet, you have to fill in some particulars in the Answer Sheet as per instructions sent to you with your Admission Certificate.
  • After you have completed filling in all your responses on the Answer Sheet and the examination has
  • concluded, you should hand over to the Invigilator only the Answer Sheet.
  • You are permitted to take away with you the Test Booklet.
  • Sheets for rough work are appended in the Test Booklet at the end.
  • Penalty for wrong answers: THERE WILL BE PENALTY FOR WRONG ANSWERS MARKED BY A CANDIDATE.
  • There are four alternatives for the answer to every question.
  • For each question for which a wrong answer (i) has been given by the candidate, one-third of the marks assigned to that question will be deducted as penalty.
  • (ii) If a candidate gives more than one answer, it will be treated as a wrong answer even if one of the given answers happens to be correct and there will be same penalty as above to that question.
  • (iii) If a question is left blank, i.e., no answer is given by the candidate, there will be no penalty for that question.
  • DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE TOLD TO DO SO (1-A)

Questions (page 2)

Q1. Consider the following diagram regarding the radial distribution function for 2s and 2p orbitals:
Which one of the following statements is a correct conclusion drawn from the diagram given above?

  • (a) 2s electrons are less shielded than 2p electrons.
  • (b) 2p electrons are less shielded than 2s electrons.
  • (c) 2s and 2p orbitals have equal probability of closer approach to nucleus.
  • (d) 2s orbital electron density is at a greater distance from nucleus than that of 2p orbital.

Q2. Which one of the following statements regarding wave functions is not correct?

  • (a) The square of the wave function gives the probability of finding the electron in the space.
  • (b) The angular wave function of a given type of orbital is dependent on the principal quantum number.
  • (c) The radial function of 2s orbital is both positive and negative.
  • (d) The probability of finding the electron density is zero at a node in the wave function.

Q3. The electronic configuration of an ion M^{3+} generated from an element with atomic number 58 is:

  • (a) [Xe] 4f1 5d1 6s2
  • (b) [Xe] 4f1
  • (c) [Rn] 5f6 6d1 7s2
  • (d) [Rn] 5f2

Q4. Which one of the following rules for filling of atomic orbitals is violated in the electronic configuration 1s2 2s2 2p2 2py^1?

  • (a) Hund's rule of maximum multiplicity
  • (b) Pauli's exclusion principle
  • (c) Aufbau principle
  • (d) Slater's rule

Q5. Which one of the following pair of elements will have similar atomic radii in d-block of the periodic table?

  • (a) Sc, Ti
  • (b) La, Hf
  • (c) Zr, Hf
  • (d) Fe, Ru

Q6. The number of unpaired electrons in the ground state of Lu^{3+} ion (atomic number 71) is:

  • (a) Zero
  • (b) One
  • (c) Two
  • (d) Three

Q7. The electronic configuration of the outermost shell of all noble gases are ns2 np6 EXCEPT :

  • (a) Xe
  • (b) Ar
  • (c) He
  • (d) Ne

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Frequently asked questions

What is the name of the examination?

The examination is the Combined Geo-Scientist (Preliminary) Examination.

Which year is this question paper for?

This question paper is for the year 2023.

Who conducts the Combined Geo-Scientist Examination?

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

What is the subject of Paper II?

Paper II of this examination is for Chemistry.

What is the maximum number of marks for Paper II?

The maximum marks for Paper II (Chemistry) is 300.

What is the time duration allowed for Paper II?

The time allowed for Paper II is Two Hours.

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