CBSE Class 12 Chemistry 2020 Main Exam Set-1 Previous Year Question Paper
This is the CBSE Class 12 Chemistry 2020 Main Exam Set-1 Previous Year Question Paper. The paper comprises four sections: A, B, C, and D, with a total of 37 questions. Section A includes 20 very short answer questions (1 mark each). Section B has 7 short answer questions (2 marks each). Section C contains 7 long answer type-I questions (3 marks each). Section D features 3 long answer type-II questions (5 marks each). While there is no overall choice, internal choices are provided in some questions across sections B, C, and D. Calculators and log tables are not permitted. Solving this board question paper is crucial for students to understand the exam pattern, identify important topics, and enhance their preparation for the CBSE board examinations.
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Quick info
| Board | CBSE |
|---|---|
| Class | 12 |
| Subject | Chemistry |
| Session | 2020 |
| Language | English |
| Type | Previous Year Question Paper |
| Exam type | Board Exam |
Paper pattern
The question paper has 37 questions divided into four sections (A, B, C, D). Section A has 20 questions of 1 mark each, Section B has 7 questions of 2 marks each, Section C has 7 questions of 3 marks each, and Section D has 3 questions of 5 marks each.
Topics covered
Paper topics
- Transition Elements
- Electronic Configuration
- Oxidation States
- Complex Formation
- Catalytic Activity
- d-block Elements
Important topics
- Transition Elements
- Electronic Configuration
- d-orbitals
PDF preview
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Question paper text
CBSE Board Paper Solution-2020
Class : XII Subject : Chemistry Set : 1 Code No : 56/3/1
General Instructions
Read the following instructions very carefully and strictly follow them:
- ١. This question paper comprises four Sections – A, B, C and D. There are 37 questions in the question paper. All questions are compulsory.
- Section A – Questions no. 1 to 20 are very short answer type questions carrying 1 mark each. Answer these questions in one word or one sentence.
- Section B – Questions no. 21 to 27 are short answer type questions, carrying 2 marks each.
İ٧. Section C –Questions no. 28 to 34 are long answer type-I questions, carrying 3 marks each.
- ٧. Section D –Questions no. 35 to 37 are long answer type-II questions, carrying 5 marks each.
- There is no overall choice in the question paper. However, an internal choice has been provided in 2 questions of two marks, 2 questions of three marks and all the 3 questions of five marks. You have to attempt only one of the choices in such questions.
- In addition to this, separate instructions are given with each section and question, wherever necessary.
- Use of calculators and log tables is not permitted.
SECTION A
Read the given passage and answer the questions number 1 to 5 that follow: <math>1\times5=5</math>
The d-block of the periodic table contains the elements of the groups 3-12 and are known as transition elements. In general, the electronic configuration of these elements is <math>(n - 1) d^{1-10}</math> ns<sup>1-2</sup>.The d-orbitals of the penultimate energy level in their atoms receive electrons giving rise to the three rows of the transition metals i.e., 3d, 4d and 5d series. However, Zn, Cd and Hg are not regarded as transition elements. Transition elements exhibit certain characteristic properties like variable oxidation states, complex formation, formation of coloured ions and alloys, catalytic activity, etc. Transition metals are hard (except Zn, Cd and Hg) and have a high melting point.
- Why are Zn, Cd and Hg non-transition elements?
Answer.
Transition elements have incomplete d-subshell in ground state with exceptions of group 11 and 12 elements.
Zn, Cd and Hg have general configuration (n-1) d<sup>10</sup> ns<sup>2</sup>, i.e., they have completely filled d-orbitals. Therefore, they are non-transition elements but are d-block
Frequently asked questions
What is this document?
This is the CBSE Class 12 Chemistry 2020 Main Exam Set-1 Previous Year Question Paper for board exam practice.
What is the structure of the Chemistry 2020 exam paper?
The paper has 37 questions across four sections (A, B, C, D) with varying marks per question: 1, 2, 3, and 5 marks.
Are there any choices in the questions?
Yes, internal choices are provided in some questions of 2, 3, and 5 marks. There is no overall choice in the question paper.
What is the duration and marking scheme?
The provided text details the number of questions and marks per section but not the total time or overall marks.
How can solving this previous year paper help?
Solving this previous year question paper helps students understand the board pattern, identify important topics, and improve their performance in the CBSE Class 12 Chemistry exam.
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