Chemistry Paper-I 2021 CS Main (Hindi-English) – Central Govt Jobs

Central Government Jobs Other Jobs 2021

  • Year 2021
  • Conducted By Not specified
  • Maximum Marks 250
  • Duration Three Hours Question Paper Specific Instructions (please Read Each Of The Following Instructions Carefully Before Attempting Questions) There Are Eight Questions Divided In Two Sections And Printed Both In Hindi And In English. Candidate Has To Attempt Five Questions In All. Question Nos. 1 And 5 Are Compulsory And Out Of The Remaining, 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 Have 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 Booklet Must Be Clearly Struck Off.
  • Languages Hindi & English

Exam Details

Detail Information
Examination Chemistry Paper-I
Year 2021
Conducting Body Not specified
Subject Chemistry
Duration Three Hours Question Paper Specific Instructions (please Read Each Of The Following Instructions Carefully Before Attempting Questions) There Are Eight Questions Divided In Two Sections And Printed Both In Hindi And In English. Candidate Has To Attempt Five Questions In All. Question Nos. 1 And 5 Are Compulsory And Out Of The Remaining, 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 Have 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 Booklet Must Be Clearly Struck Off.
Maximum Marks 250

Page 1 outlines the Chemistry Paper-I format for the CS (Main) Exam 2021, including maximum marks (250), duration (three hours), and bilingual (Hindi-English) question paper with eight questions divided into two sections. It specifies that candidates must answer five questions, with questions 1 and 5 compulsory, and that responses must be written in the medium stated on the admit card. Page 2 provides repaired OCR for Section A: two sub-questions under Question 1. (a) requests the expectation value of a particle in a 1D box (0 to 1) and includes bilingual presentation. (b) presents a Born-Haber cycle problem about the formation of NaCl2, with thermodynamic data for NaCl and NaCl2 including U0 values, ionization energies, electron affinity, dissociation, and sublimation terms; the task is to discuss the possibility of NaCl2 formation.

Major Topics Covered

  • Chemistry
  • Paper-I
  • Main Exam
  • Hindi-English bilingual
  • QCA Booklet
  • Question Paper Instructions
  • Section A
  • Section B
  • One-dimensional quantum system
  • Expectation value
  • Born-Haber cycle
  • Enthalpy of formation
  • Ionic compound formation
  • NaCl
  • NaCl2
  • Ionization energy
  • Electron affinity
  • Sublimation enthalpy
  • Dissociation enthalpy
  • Thermodynamics data interpretation

Why This Paper is Important

  • Useful for Chemistry Paper-I 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

Instructions

  • इसमें आठ प्रश्न हैं जो दो खण्डों में विभाजित हैं तथा हिन्दी और अंग्रेजी दोनों में छपे हुए हैं।
  • परीक्षार्थी को कुल पाँच प्रश्नों के उत्तर देने हैं।
  • प्रश्न संख्या 1 और 5 अनिवार्य हैं तथा बाकी प्रश्नों में से प्रत्येक खण्ड से कम-से-कम एक प्रश्न चुनकर तीन प्रश्नों के उत्तर दीजिए।
  • प्रत्येक प्रश्न/भाग के लिए नियत अंक उसके सामने दिए गए हैं।
  • प्रश्नों के उत्तर उसी प्राधिकृत माध्यम में लिखे जाने चाहिए, जिसका उल्लेख आपके प्रवेश-पत्र में किया गया है, और इस माध्यम का स्पष्ट उल्लेख प्रश्न-सह-उत्तर (क्यू० सी० ए०) पुस्तिका के मुखपृष्ठ 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 प्रयासों की गणना क्रमानुसार की जाएगी।
  • आंशिक रूप से दिए गए प्रश्नों के उत्तर को भी मान्यता दी जाएगी यदि उसे काटा न गया हो।
  • प्रश्न-सह-उत्तर पुस्तिका में खाली छोड़े गए कोई पृष्ठ अथवा पृष्ठ के भाग को पूर्णतः काट दीजिए।

  • There are EIGHT questions divided in two Sections and printed both in HINDI and in ENGLISH.
  • Candidate has to attempt FIVE questions in all.
  • Question Nos. 1 and 5 are compulsory and out of the remaining, 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 have 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 Booklet must be clearly struck off.

Questions (page 2)

Q1.

(a) 1. (a) एक-विमीय बॉक्स, जिसकी लंबाई 0 से 1 है, में एक कण जो कि मूल अवस्था में है, की स्थिति के अपेक्षा मान, \\langle x \\rangle, का परिकलन कीजिए। Calculate \\langle x \\rangle, the expectation value of position of a particle, in the ground state of one-dimensional box having length from 0 to l.

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Chemistry Paper-I 2021 CS Main (Hindi-English) – Central Govt Jobs — page 1 instructions scan PDF download
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Frequently asked questions

What is the maximum marks for Chemistry Paper-I?

250 marks.

How many questions must a candidate attempt?

Five questions in total.

Which questions are compulsory?

Questions 1 and 5 are compulsory.

In what languages is the paper printed?

Hindi and English.

From which sections should at least one question be chosen?

At least one question from each section.

Where must answers be written?

In the medium authorized on the admit card, as specified on the QCA booklet cover.

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