Indian Forest Service 2017 Chemistry Paper I Question Paper PDF

Central Government Jobs Other Jobs 2017

  • Year 2017
  • Conducted By UPSC
  • Questions 8
  • Maximum Marks 200
  • Duration Three Hours
  • Languages English

Exam Details

Detail Information
Examination Indian Forest Service (Main) Examination
Year 2017
Conducting Body UPSC
Paper Chemistry Paper - I
Subject Chemistry
Duration Three Hours
Maximum Marks 200
Number of Questions 8
Question Type Descriptive / Subjective

This document contains the Indian Forest Service (Main) Examination, 2017 Chemistry Paper I question paper, conducted by UPSC. The paper is designed to assess candidates' in-depth knowledge of Chemistry, with a maximum of 200 marks and a time limit of three hours. It comprises eight questions, of which five are to be attempted, with questions 1 and 5 being compulsory. Candidates must select at least one question from each of the two sections (A and B) from the remaining six questions. This paper is a crucial resource for aspirants preparing for the IFS Mains examination, providing valuable insights into the exam's structure, difficulty, and subject coverage.

Major Topics Covered

  • Solid State Chemistry
  • Chemical Kinetics
  • Atomic Structure
  • Thermodynamics
  • Quantum Mechanics
  • Physical Chemistry

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, 2017 - Chemistry Paper II
  • Indian Forest Service (Main) Examination, 2016 - Chemistry Paper I
  • UPSC Civil Services Exam 2017 - Optional Subject Papers
  • Indian Forest Service 2017 Chemistry Paper I Answer Key
  • Indian Forest Service Chemistry Syllabus
  • UPSC Mains Optional Subject Syllabus
  • Indian Forest Service Mains Exam Pattern
  • UPSC Exam Pattern for Optional Subjects

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 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.
  • Answers must be written in ENGLISH only.
  • 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. k_B = 1.38 \times 10^{-23} JK-1 h = 6.626 \times 10^{-34} Js R = 8.314 \text{ JK}^{-1} \text{ mol}^{-1} \pi = 3.14 c = 3 \times 10^8 ms-1.
  • F = 96500 C N_A = 6.023 \times 10^{23} 1 atm = 101325 Pa \mathcal I

Questions (page 2)

Section A

Q1.

(a) NaCl (molecular weight : 58.5) consists of a face-centred cubic lattice of Na^+ ions interlocked with a similar lattice of Cl^- ions and has a density of 2.17 g/cm^3. Draw the unit cell structure of NaCl. (i) Calculate the number of Na^+ and Cl^- ions that are present in a unit cell. (ii) Calculate the volume of the unit cell. (iii) The first-order reflection from the d_{100} planes of NaCl occurs at 5.9°. Calculate the wavelength of X-ray.

(b) For the reaction A → B + C the following data were obtained : t in sec
0
900
1800
conc. of A
50.8
19.7
7.62
Prove that the reaction is of the first order.

(c) What would be the value of the principal quantum number, if an electron in a hydrogen atom was in the orbital of energy -0.242 × 10-18 J? Given : k = 2.179 × 10-18 J.

(d) Calculate the work done when 1 mole of He expands isothermally and reversibly from a volume of 1 litre to a volume of 10 litres at 25°C.

Section A

Q2.

(a) If uncertainty in position is written as \Delta x and in momentum as \Delta p, then Heisenberg Uncertainty principle is \Delta p \Delta x ≥ h/4π. If the position of an electron is known to within 10-12 m, what is the uncertainty in its momentum ? Given h = 6.626 × 10-34 Js and π = 3.14.

(b) One mole of water is vapourised reversibly at 100°C and 1 atm. H2O (l) \rightleftharpoons H2O (g) The heat of vapourisation of water is 9720 cal/mol. Calculate W, \Delta E, \Delta H and \Delta S.

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Frequently asked questions

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

This is the question paper for the Indian Forest Service (Main) Examination, 2017.

Which subject does this paper cover?

This paper covers Chemistry, specifically Paper I.

Who conducts the Indian Forest Service Examination?

The Indian Forest Service Examination is conducted by the UPSC (Union Public Service Commission).

What is the maximum marks for this paper?

The maximum marks for Chemistry Paper - I is 200.

What is the time duration allowed for this paper?

The time allowed for this paper is Three Hours.

How many questions are there in total, and how many are to be attempted?

There are eight questions in total, and candidates are required to attempt five.

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