UPSC Civil Services Main 2025 Chemistry Paper I Question Paper PDF

Central Government Jobs Other Jobs 2025

  • Year 2025
  • Conducted By UPSC
  • Questions 8
  • Maximum Marks 250
  • Duration Three Hours
  • Languages Hindi & English

Exam Details

Detail Information
Examination UPSC Civil Services (Main) Examination
Year 2025
Conducting Body UPSC
Paper Chemistry Paper I
Subject Chemistry
Duration Three Hours
Maximum Marks 250
Number of Questions 8
Question Type Descriptive / Subjective

This is the official question paper for the UPSC Civil Services (Main) Examination 2025, Chemistry Paper I. Conducted by the UPSC, this paper is designed to assess candidates' in-depth knowledge of Chemistry. It allows a duration of three hours to complete and carries a maximum of 250 marks. The paper consists of eight questions divided into two sections, with candidates required to answer five questions in total, including compulsory questions 1 and 5. This paper is crucial for aspirants aiming for top positions in the Civil Services, providing a clear understanding of the exam's scope and difficulty level.

Major Topics Covered

  • Chemistry
  • Fundamental Constants
  • Conversion Factors

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 2025 General Studies Paper I
  • UPSC Civil Services Main 2025 General Studies Paper II
  • UPSC Civil Services Main 2025 General Studies Paper III
  • UPSC Civil Services Main 2025 General Studies Paper IV
  • UPSC Civil Services Main 2025 Optional Subject Paper I
  • UPSC Civil Services Main 2025 Optional Subject Paper II
  • UPSC Civil Services Main 2025 Chemistry Paper I Answer Key
  • UPSC Civil Services Main Chemistry Syllabus

Instructions

  • पुस्तिका के मुख पृष्ठ पर निर्दिष्ट स्थान पर किया जाना चाहिए।
  • प्राधिकृत माध्यम के अतिरिक्त अन्य किसी माध्यम में लिखे 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 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।
  • प्रश्न-सह-उत्तर पुस्तिका (क्यू.सी.ए.) 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.
  • Questions no. 1 and 5 are compulsory and out of the remaining, any THREE are to be attempted choosing at least ONE question 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.
  • 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 (QCA) Booklet must be clearly struck off.

Questions (page 2)

Q1. Some useful fundamental constants and conversion factors

(a) NA = 6.022 × 1023 \text mol-1

(b) Rydberg constant = 2.178 × 10-18 \text J

(c) c = 2.998 × 108 \text ms-1

(d) kB = 1.38 × 10-23 \text JK-1

(e) e = 1.602 × 10-19 \text C

(f) me = 9.109 × 10-31 \text kg

(g) F = 96485 \text C mol-1

(h) R = 8.314 \text JK-1 \text mol-1

(i) h = 6.626 × 10-34 \text Js

(j) π = 3.142

(k) 1 \text amu = 1.66 × 10-27 \text kg

(l) 1 \text cal = 4.184 \text J

(m) 1 \text J = 1 \text kg m2 \text s-2

(n) 1 \text Å = 10-8 \text cm = 10-10 \text m = 0.1 \text nm = 100 \text pm

(o) 1 \text atm = 760 \text torr = 1.01325 × 105 \text Pa

(p) 1 \text bar = 1 × 105 \text Pa = 0.9869 \text atm

(q) 1 \text eV = 1.602 × 10-19 \text J

(r) 1 \text L atm = 101.34 \text J

(s) 1 \text eV = 23060 \text cal/mol

(t) 4 π^2 c2 = 3.55 × 1022 \text cm2 \text s-2

(u) (h2)/(8me) = 6.025 × 10-38 \text Jm-2

(v) hc = 1.986 × 10-26 \text Jm

Question paper preview

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Frequently asked questions

What is the name of the exam?

The exam is the UPSC Civil Services (Main) Examination.

Which paper is this question paper for?

This is for Chemistry Paper I.

What is the year of this examination?

The year is 2025.

Who conducts the Civil Services Examination?

The 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 Chemistry Paper I?

The time allowed is Three Hours.

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