Class 11 Chemistry Exam - Matliwala Public School

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Questions and Answers

Which of the following sections in the Chemistry annual examination paper for Class 11 contains case-based questions?

  • Section D (correct)
  • Section B
  • Section E
  • Section C

In the Class 11 Chemistry annual examination, Section A consists of very short answer questions.

False (B)

What is the total number of questions in the Class 11 Chemistry annual examination paper?

33

According to the instructions, the total time allowed for the Class 11 Chemistry annual examination is ______ minutes.

<p>180</p> Signup and view all the answers

Which section in the Chemistry annual examination paper for Class 11 consists of short answer questions carrying 3 marks each?

<p>Section C (B)</p> Signup and view all the answers

Which of the following best describes the role of entropy in determining the spontaneity of a reaction?

<p>The change in entropy, along with the change in enthalpy, determines spontaneity; reactions are spontaneous at all temperatures only if entropy increases and enthalpy decreases. (A)</p> Signup and view all the answers

Explain, using principles of chemical bonding and molecular structure, why $BF_3$ is nonpolar while $NF_3$ is polar.

<p>BF3 has a trigonal planar geometry with bond dipoles canceling each other out, resulting in a zero dipole moment. NF3 has a trigonal pyramidal geometry, and the lone pair on nitrogen contributes to a net dipole moment, making it polar.</p> Signup and view all the answers

In a redox reaction, how does the oxidizing agent facilitate the reaction?

<p>By gaining electrons and decreasing its oxidation state. (B)</p> Signup and view all the answers

In organic chemistry, the inductive effect is a distance-dependent phenomenon that describes the unequal sharing of electrons in a sigma bond; an electron-withdrawing group exhibits a ______ inductive effect.

<p>-I</p> Signup and view all the answers

Considering the periodic trends, which of the following elements would you expect to have the highest ionization energy?

<p>Fluorine (F) (D)</p> Signup and view all the answers

Match the following concepts with their descriptions:

<p>Hybridization = Mixing of atomic orbitals to form new hybrid orbitals suitable for the pairing of electrons to form chemical bonds Resonance = A way of describing delocalized electrons within certain molecules or polyatomic ions where the bonding cannot be expressed by one single Lewis structure Dipole Moment = A measure of the polarity of a chemical bond within a molecule Formal Charge = The charge assigned to an atom in a molecule, assuming that electrons in all chemical bonds are shared equally between atoms</p> Signup and view all the answers

Flashcards

Total number of questions

The exam has 33 questions with internal choices.

Section A question type

Section A has 16 multiple-choice questions.

Section B question type

Section B contains very short answer type questions.

Section C question type

Section C contains short answer type questions.

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Section D question type

Section D includes case-based questions.

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Chemical Thermodynamics

Deals with energy changes in chemical reactions.

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Redox Reactions

Reactions involving transfer of electrons, changing oxidation states.

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Organic Chemistry

Study of carbon-containing compounds.

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Hydrocarbons

Simplest organic compounds, containing only carbon and hydrogen.

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Periodic Table

Arrangement of elements by atomic number, showing periodic trends.

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Chemical Bond

Attraction between atoms that holds molecules together.

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Equilibrium

State where forward and reverse reaction rates are equal.

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Chemical Formula

Expression of the relative number of atoms of each element in a compound.

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Solution

A homogeneous mixture of two or more substances.

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Atom

The smallest particle of an element that can exist.

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Study Notes

  • The Class 11 Chemistry Annual Examination for Matliwala Public School, academic session 2023-2024, has a maximum score of 70.0.
  • The time allowed for the exam is 180 minutes.
  • There are 33 compulsory questions with internal choice.
  • Log tables and calculators are not permitted.
  • Section A contains 16 multiple-choice questions, each worth 1 mark.
  • Section B contains 5 very short answer questions, each worth 2 marks.
  • Section C contains 7 short answer questions, each worth 3 marks.
  • Section D contains 2 case-based questions, each worth 4 marks.
  • Section E consists of 3 long answer questions, each worth 5 marks.

Question Breakdown by Chapter:

Some Basic Concepts of Chemistry:

  • Includes 1 Assertion & Reason question.
  • Includes 1 Multiple Choice question.
  • Includes 1 Subjective question (2 marks).
  • Includes 1 Subjective question (3 marks).
  • This chapter's questions total 7 marks.

Structure of Atom:

  • Includes 1 Assertion & Reason question.
  • Includes 3 Multiple Choice questions.
  • Includes 1 Subjective question (2 marks).
  • Includes 1 Subjective question (3 marks).
  • This chapter's questions total 9 marks.

Chemical Thermodynamics:

  • Includes 3 Multiple Choice questions.
  • Includes 1 Subjective question (3 marks).
  • Total marks for this section are 6.

Redox Reactions:

  • Includes 1 Multiple Choice question.
  • Includes 1 Subjective question (3 marks).
  • Total marks for this section are 4.

Organic Chemistry - Basic Principles and Techniques:

  • Includes 1 Assertion & Reason question.
  • Includes 1 Multiple Choice question.
  • Includes 1 Source/Case-based question.
  • Total marks for this section are 6.

Hydrocarbons:

  • Includes 1 Assertion & Reason question.
  • Includes 2 Multiple Choice questions.
  • Includes 1 Subjective question (2 marks).
  • This chapter's questions total 5 marks.

Classification of Elements and Periodicity in Properties:

  • Includes 1 Multiple Choice question.
  • Includes 1 Subjective question (2 marks).
  • Includes 1 Subjective question (3 marks).
  • Total marks for this section are 6.

Chemical Bonding and Molecular Structure:

  • Includes 1 Source/Case-based question.
  • Includes 1 Subjective question (3 marks).
  • Total marks for this section are 7

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