Practice Question Paper — not an official CBSE document
Class 12 · Chemistry
Subject Code 043 · Set 2 of 3
Time allowed: 3 hoursMaximum marks: 7033 questions
Theory 70 + practical 30. This page is the 70-mark theory practice paper.
General instructions
This practice paper has 33 questions in five sections and is of 70 marks (theory). Practical / project work is separate (30 marks).
Section A: Q1–12 MCQ and Q13–16 Assertion–Reason, 1 mark each.
Section B: Q17–21 very short answers of 2 marks each.
Section C: Q22–28 short answers of 3 marks each.
Section D: Q29–30 case-study / source-based questions of 4 marks each.
Section E: Q31–33 long answers of 5 marks each. Internal choice is given in some questions.
There is no overall choice. Attempt only one option where an internal choice is given.
Practice questions aligned to NCERT topics used in CBSE classrooms. These are original exam-oriented questions for revision — not official CBSE board papers and not a guarantee of any exam question. Always match the textbook issued by your school and the latest PDFs on ncert.nic.in and cbseacademic.nic.in.
Section A
Objective type (MCQ and Assertion–Reason) · Q1–16 · 1 mark each · 16 marks
Q.1MCQAldehydes, Ketones and Carboxylic Acids[1]
Choose the correct statement related to Revision in the chapter Aldehydes, Ketones and Carboxylic Acids.
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Answer / marking points
C. Write three points from Aldehydes, Ketones and Carboxylic Acids in your own words; that is enough for a short-answer start
Note
Write three points from Aldehydes, Ketones and Carboxylic Acids in your own words; that is enough for a short-answer start. The other options mix ideas from nearby topics or reverse the textbook fact.
Q.2MCQChemical Kinetics[1]
Choose the correct statement related to Chemical Kinetics in the chapter Chemical Kinetics.
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Answer / marking points
C. Rate law
Note
Rate law. The other options mix ideas from nearby topics or reverse the textbook fact.
Q.3MCQAldehydes, Ketones and Carboxylic Acids[1]
Choose the correct statement related to Aldehydes, Ketones and Carboxylic Acids in the chapter Aldehydes, Ketones and Carboxylic Acids.
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Answer / marking points
D. Acidity of carboxylic acids
Note
Acidity of carboxylic acids. The other options mix ideas from nearby topics or reverse the textbook fact.
Q.4MCQChemical Kinetics[1]
Choose the correct statement related to Textbook first in the chapter Chemical Kinetics.
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Answer / marking points
D. Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions
Note
Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions. The other options mix ideas from nearby topics or reverse the textbook fact.
Q.5MCQAldehydes, Ketones and Carboxylic Acids[1]
Choose the correct statement related to Diagrams in the chapter Aldehydes, Ketones and Carboxylic Acids.
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Answer / marking points
D. If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures
Note
If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures. The other options mix ideas from nearby topics or reverse the textbook fact.
Q.6MCQChemical Kinetics[1]
Choose the correct statement related to Practice in the chapter Chemical Kinetics.
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Answer / marking points
C. Mix MCQs with short answers so you remember both facts and explanations from Chemical Kinetics
Note
Mix MCQs with short answers so you remember both facts and explanations from Chemical Kinetics. The other options mix ideas from nearby topics or reverse the textbook fact.
Q.7MCQAldehydes, Ketones and Carboxylic Acids[1]
Choose the correct statement related to Aldehydes, Ketones and Carboxylic Acids in the chapter Aldehydes, Ketones and Carboxylic Acids.
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Answer / marking points
A. Tollens, Fehling
Note
Tollens, Fehling. The other options mix ideas from nearby topics or reverse the textbook fact.
Q.8MCQChemical Kinetics[1]
Choose the correct statement related to Chemical Kinetics in the chapter Chemical Kinetics.
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Answer / marking points
A. Chemical Kinetics is an NCERT chapter taught in CBSE Class 12 Chemistry
Note
Chemical Kinetics is an NCERT chapter taught in CBSE Class 12 Chemistry. The other options mix ideas from nearby topics or reverse the textbook fact.
Q.9MCQAldehydes, Ketones and Carboxylic Acids[1]
Choose the correct statement related to Examples in the chapter Aldehydes, Ketones and Carboxylic Acids.
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Answer / marking points
D. CBSE often tests a concept by asking a daily-life example from the same chapter
Note
CBSE often tests a concept by asking a daily-life example from the same chapter. The other options mix ideas from nearby topics or reverse the textbook fact.
Q.10MCQChemical Kinetics[1]
Choose the correct statement related to Accuracy in the chapter Chemical Kinetics.
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Answer / marking points
D. Use the terms used in the NCERT book; do not replace them with unofficial names
Note
Use the terms used in the NCERT book; do not replace them with unofficial names. The other options mix ideas from nearby topics or reverse the textbook fact.
Q.11MCQAldehydes, Ketones and Carboxylic Acids[1]
Choose the correct statement related to Aldehydes, Ketones and Carboxylic Acids in the chapter Aldehydes, Ketones and Carboxylic Acids.
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Answer / marking points
D. Aldol, Cannizzaro as in syllabus
Note
Aldol, Cannizzaro as in syllabus. The other options mix ideas from nearby topics or reverse the textbook fact.
Q.12MCQChemical Kinetics[1]
Choose the correct statement related to Chemical Kinetics in the chapter Chemical Kinetics.
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Answer / marking points
B. Collision theory outline
Note
Collision theory outline. The other options mix ideas from nearby topics or reverse the textbook fact.
Q.13Assertion and ReasonAldehydes, Ketones and Carboxylic Acids[1]
Assertion (A): Every chapter ends with keywords or a summary that is useful for one-mark answers.
Reason (R): Keywords is a key idea in the chapter Aldehydes, Ketones and Carboxylic Acids.
Choose the correct option.
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Answer / marking points
A. Both A and R are true, and R is the correct explanation of A.
Note
Read Assertion and Reason separately first. Here both match the textbook idea, and R explains why A is taught in this chapter.
Q.14Assertion and ReasonChemical Kinetics[1]
Assertion (A): Write three points from Chemical Kinetics in your own words; that is enough for a short-answer start.
Reason (R): Revision is a key idea in the chapter Chemical Kinetics.
Choose the correct option.
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Answer / marking points
A. Both A and R are true, and R is the correct explanation of A.
Note
Read Assertion and Reason separately first. Here both match the textbook idea, and R explains why A is taught in this chapter.
Q.15Assertion and ReasonAldehydes, Ketones and Carboxylic Acids[1]
Assertion (A): Nucleophilic addition.
Reason (R): Aldehydes, Ketones and Carboxylic Acids is a key idea in the chapter Aldehydes, Ketones and Carboxylic Acids.
Choose the correct option.
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Answer / marking points
A. Both A and R are true, and R is the correct explanation of A.
Note
Read Assertion and Reason separately first. Here both match the textbook idea, and R explains why A is taught in this chapter.
Q.16Assertion and ReasonChemical Kinetics[1]
Assertion (A): Arrhenius k=Ae^{−Ea/RT}.
Reason (R): Chemical Kinetics is a key idea in the chapter Chemical Kinetics.
Choose the correct option.
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Answer / marking points
A. Both A and R are true, and R is the correct explanation of A.
Note
Read Assertion and Reason separately first. Here both match the textbook idea, and R explains why A is taught in this chapter.
Section B
Very Short Answer · Q17–21 · 2 marks each · 10 marks
Q.172 MarkAldehydes, Ketones and Carboxylic Acids[2]
Give two points to explain Textbook first as used in Aldehydes, Ketones and Carboxylic Acids.
Show answer / marking points
Answer / marking points
1. Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Note
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
Q.182 MarkChemical Kinetics[2]
Give two points to explain Diagrams as used in Chemical Kinetics.
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Answer / marking points
1. If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Note
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
Q.192 MarkAldehydes, Ketones and Carboxylic Acids[2]
Give two points to explain Practice as used in Aldehydes, Ketones and Carboxylic Acids.
Show answer / marking points
Answer / marking points
1. Mix MCQs with short answers so you remember both facts and explanations from Aldehydes, Ketones and Carboxylic Acids.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Note
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
Q.202 MarkChemical Kinetics[2]
Give two points to explain First order t½=0 as used in Chemical Kinetics.
Show answer / marking points
Answer / marking points
1. First order t½=0.693/k.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Note
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
Q.212 MarkAldehydes, Ketones and Carboxylic Acids[2]
Give two points to explain Aldehydes, Ketones and Carboxylic Acids as used in Aldehydes, Ketones and Carboxylic Acids.
Show answer / marking points
Answer / marking points
1. Aldehydes, Ketones and Carboxylic Acids is an NCERT chapter taught in CBSE Class 12 Chemistry.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Note
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
Section C
Short Answer · Q22–28 · 3 marks each · 21 marks
Q.223 MarkChemical Kinetics[3]
Explain Examples in about three points, with one example.
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Answer / marking points
CBSE often tests a concept by asking a daily-life example from the same chapter. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
Note
Three-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
Q.233 MarkAldehydes, Ketones and Carboxylic Acids[3]
Explain Accuracy in about three points, with one example.
Show answer / marking points
Answer / marking points
Use the terms used in the NCERT book; do not replace them with unofficial names. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
Note
Three-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
Q.243 MarkChemical Kinetics[3]
Explain Chemical Kinetics in about three points, with one example.
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Answer / marking points
Order vs molecularity. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
Note
Three-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
Q.253 MarkAldehydes, Ketones and Carboxylic Acids[3]
Explain Aldehydes, Ketones and Carboxylic Acids in about three points, with one example.
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Answer / marking points
Hell–Volhard–Zelinsky if included. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
Note
Three-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
Q.263 MarkChemical Kinetics[3]
Explain Keywords in about three points, with one example.
Show answer / marking points
Answer / marking points
Every chapter ends with keywords or a summary that is useful for one-mark answers. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
Note
Three-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
Q.273 MarkAldehydes, Ketones and Carboxylic Acids[3]
Explain Revision in about three points, with one example.
OR
Explain Amines in about three points, with one example.
Show answer / marking points
Answer / marking points
Write three points from Aldehydes, Ketones and Carboxylic Acids in your own words; that is enough for a short-answer start. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
Note
Three-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
OR — marking points
Diazonium coupling. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
Q.283 MarkChemical Kinetics[3]
Explain Chemical Kinetics in about three points, with one example.
OR
Explain Textbook first in about three points, with one example.
Show answer / marking points
Answer / marking points
Rate law. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
Note
Three-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
OR — marking points
Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
Section D
Case-study / source-based · Q29–30 · 4 marks each · 8 marks
Q.29Case BasedAldehydes, Ketones and Carboxylic Acids[4]
A student is revising Aldehydes, Ketones and Carboxylic Acids and notes: “Acidity of carboxylic acids.” Using this case, answer: (i) Name the idea. (ii) State it in your own words. (iii) Give one classroom or daily-life use.
Show answer / marking points
Answer / marking points
(i) Aldehydes, Ketones and Carboxylic Acids.
(ii) Acidity of carboxylic acids.
(iii) Apply it in a school experiment, a labelled diagram, or a situation described in the NCERT chapter.
Note
Case-based items recycle a short story. Pull the fact out first, then apply it. This is original practice in CBSE case style — not a copied board paper.
Q.30Case BasedChemical Kinetics[4]
A student is revising Chemical Kinetics and notes: “Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions.” Using this case, answer: (i) Name the idea. (ii) State it in your own words. (iii) Give one classroom or daily-life use.
Show answer / marking points
Answer / marking points
(i) Textbook first.
(ii) Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions.
(iii) Apply it in a school experiment, a labelled diagram, or a situation described in the NCERT chapter.
Note
Case-based items recycle a short story. Pull the fact out first, then apply it. This is original practice in CBSE case style — not a copied board paper.
Section E
Long Answer · Q31–33 · 5 marks each · 15 marks
Q.315 MarkAldehydes, Ketones and Carboxylic Acids[5]
Write a long answer on Diagrams. Include definition, explanation and one application.
Show answer / marking points
Answer / marking points
Diagrams — If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures. Explain the idea in order (definition → working → result). End with one application from daily life or a numerical/diagram if the chapter has one.
Note
Long answers are marked for structure. Use headings or numbered steps so the examiner can see each part.
Q.325 MarkChemical Kinetics[5]
Write a long answer on Practice. Include definition, explanation and one application.
OR
Write a long answer on The d- and f-Block Elements. Include definition, explanation and one application.
Show answer / marking points
Answer / marking points
Practice — Mix MCQs with short answers so you remember both facts and explanations from Chemical Kinetics. Explain the idea in order (definition → working → result). End with one application from daily life or a numerical/diagram if the chapter has one.
Note
Long answers are marked for structure. Use headings or numbered steps so the examiner can see each part.
OR — marking points
The d- and f-Block Elements — The d- and f-Block Elements is an NCERT chapter taught in CBSE Class 12 Chemistry. Explain the idea in order (definition → working → result). End with one application from daily life or a numerical/diagram if the chapter has one.
Q.335 MarkAldehydes, Ketones and Carboxylic Acids[5]
Write a long answer on Aldehydes, Ketones and Carboxylic Acids. Include definition, explanation and one application.
OR
Write a long answer on Examples. Include definition, explanation and one application.
Show answer / marking points
Answer / marking points
Aldehydes, Ketones and Carboxylic Acids — Tollens, Fehling. Explain the idea in order (definition → working → result). End with one application from daily life or a numerical/diagram if the chapter has one.
Note
Long answers are marked for structure. Use headings or numbered steps so the examiner can see each part.
OR — marking points
Examples — CBSE often tests a concept by asking a daily-life example from the same chapter. Explain the idea in order (definition → working → result). End with one application from daily life or a numerical/diagram if the chapter has one.
