Indian Forest Service 2022 Chemistry Paper I Question Paper PDF

Central Government Jobs Other Jobs 2022

  • Year 2022
  • Conducted By UPSC
  • Questions 8
  • Maximum Marks 200
  • Duration Three Hours
  • Languages English

Exam Details

Detail Information
Examination Indian Forest Service (Main) Examination
Year 2022
Conducting Body UPSC
Paper Chemistry Paper - I
Subject Chemistry
Duration Three Hours
Maximum Marks 200
Number of Questions 8
Question Type Mixed

This is the official question paper for the Indian Forest Service (Main) Examination 2022, Chemistry Paper I, conducted by UPSC. The paper is worth a maximum of 200 marks and allows three hours for completion. It consists of eight questions, of which five are to be attempted, with questions 1 and 5 being compulsory. Aspirants must select at least one question from each of the two sections (A and B) from the remaining six questions. This paper is crucial for candidates aiming to qualify for the Indian Forest Service, providing a clear understanding of the subject's scope and difficulty level.

Major Topics Covered

  • Wavefunction
  • Dipole Moment
  • Point Defects
  • pH Calculation
  • Ionic Activity Coefficient
  • Radial and Angular Nodes
  • Lattice Energies
  • Ionization Energy
  • Coordination Number
  • Zinc Blende Lattice

Why This Paper is Important

  • Useful for Indian Forest Service (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

  • Indian Forest Service (Main) Examination 2021 Chemistry Paper I
  • Indian Forest Service (Main) Examination 2022 Chemistry Paper II
  • UPSC Civil Services Exam 2022 Chemistry Optional Paper I
  • Indian Forest Service 2022 Chemistry Paper I Answer Key
  • UPSC IFS Main 2022 Chemistry Paper I Solutions
  • Indian Forest Service Chemistry Syllabus
  • UPSC Main Exam Syllabus
  • Indian Forest Service Exam Pattern

Instructions

  • There are EIGHT questions in all, out of which FIVE are to be attempted.
  • Out of the remaining SIX questions, THREE are to be attempted selecting at least \overline{ONE} question from each of the two Sections A and B.
  • 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.
  • The number of marks carried by a question/part is indicated against it.
  • Unless otherwise mentioned, symbols and notations have their usual standard meanings.
  • Assume suitable data, if necessary and indicate the same clearly.
  • Neat sketches may be drawn, wherever required.
  • Answers must be written in ENGLISH only. k_B = 1.38 \times 10^{-23} JK-1 = 6.626 \times 10^{-34} Js h = 8.314 \text{ JK}^{-1} \text{ mol}^{-1} \pi = 3.14 R = 3 \times 10^8 ms-1 F = 96500 \text{ C mol}^{-1} \mathbf{c} N_A = 6.023 \times 10^{23} mol-1 1 atm = 101325 Pa m_e = 9.1 \times 10^{-31} kg 1

Questions (page 2)

Section A

Q1.

(a) For an acceptable solution, the wavefunction, \phi(x) and its derivative, d\phi(x)/dx, has to be continuous. Why is this condition imposed on the wavefunction?

(b) Between NH3 and NF3, which one possesses higher dipole moment? Explain.

(c) Mention point defects which can arise for MgO as an impurity in \textAl2\textO3. How many \textMg2+ ions must be added to form each of these defects ?

(d) What is the pH of pure water at 37°C ? (Given : \Delta\rm r\rm H0 (enthalpy of ionization) at 25\circ\rm C = 55\cdot82 \rm kJ~\rm mol-1)

(e) Calculate the mean ionic activity coefficient of 0.002 M aqueous solution of potassium ferricyanide at 25°C. (Given A = 0.509)

Section A

Q2.

(a) Find the radial and angular nodes in H-orbitals, \psi3pz(r, θ, \phi) and \Psi3px (r, θ, \phi).

(b) The lattice energies (U0) for the formation of NaCl and hypothetical NaCl2 from Cl2 gas and Na-metal are -757 kJ mol-1 and -2180 kJ mol-1 and their enthalpies of formation (\Delta Hf) are -381 kJ mol-1 and + 2530 kJ mol-1, respectively. From these data, calculate the 2nd ionization energy of Na. (Given that \Delta H\rm EA for Cl and \Delta H\rm (atomic) of Cl2 → 2Cl) are -349 kJ mol-1 and + 242 kJ mol-1, respectively)

(c) (i) Prove that the minimum value of R_A/R_X = 0.155 will provide a 3 : 3 coordination for A and X ions in AX compound (A is the cation, X is the anion, R_A is the radius of cation, R_X is the radius of anion).
(ii) Zinc blende lattice is face-centered cubic. However, each atom is tetrahedrally bonded to four nearest neighbours. Explain how a Zinc blende lattice can be a face-centered cubic lattice.

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Frequently asked questions

What is the name of the exam?

The exam is the Indian Forest Service (Main) Examination.

Which year is this question paper for?

This question paper is for the 2022 examination.

Who conducts the Indian Forest Service (Main) 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 Chemistry Paper I?

The maximum marks for Chemistry Paper I is 200.

How much time is allowed to complete the paper?

Three hours are allowed to complete the paper.

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