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West Bengal Council of Higher Secondary Education (WBCHSE) Class 12 (Higher Secondary) Chemistry Set 02 (Advanced Level) English Medium 100% Free Practice Test

West Bengal Council of Higher Secondary Education (WBCHSE) Class 12 (Higher Secondary) Chemistry: d and f Block Elements Online Test (Set 02 (Advanced Level))

d and f Block Elements — Set 02 (Advanced Level)

Practise free online CBT mock test for West Bengal Council of Higher Secondary Education (WBCHSE) Class 12 (Higher Secondary) Chemistry Chapter 9 'd and f Block Elements'. 20 MCQs, 20-minute timer, instant scorecard, and step-by-step solutions aligned with official board syllabus.

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20 MCQs
Questions
⏱️
20 Mins
Duration
🎯
20 Marks
Total Marks
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+1.0
Per Correct
🛡️
0.0
Negative Mark
🌐
English
Language
Start Test Now (English Medium)
Instant Scorecard Step-by-Step Solutions WBCHSE HS Syllabus Pattern

Chapter Study Guide & In-Depth Notes

Master the key concepts, vocabulary, and high-yield questions before starting the test.

3 Sections

Chapter Overview & Core Concepts: d and f Block Elements

Class 12 Study Guide

Mastering d and f Block Elements in Class 12 provides critical subject intuition, analytical skills, and examination readiness.

Examinations test fundamental principles, definitions, cause-and-effect reasoning, and real-world applications under timed conditions.

Core Moral & Key Takeaway:

Grasping core concepts and practicing with timed chapter-wise CBT tests guarantees top performance in board exams.

Key Terminology, Definitions & Principles

Glossary & Concepts
Term / Formula Type Definition / Meaning Explanation / Notes Example / Usage
Core Concept Principle Primary concept governing d and f Block Elements. मुख्य सिद्धांत "Understand and apply the principle accurately."
Analytical Deduction Skill Evaluating evidence to draw correct conclusions. तार्किक विश्लेषण "Examine question clues systematically."

Key Features & Devices Explored:

Systematic Elimination
Eliminate distractor choices before selecting the best answer.
Pacing & Accuracy
Complete each question within 60 seconds to maintain steady momentum.

High-Yield Revision Points & Solved Board Exam Q&A

Revision Notes
⚡ High-Yield Exam Takeaways:
  • Review all key textbook terms, definitions, and formulas.
  • Pay attention to units, boundary values, and key keywords in questions.
  • Solve Foundation Set 01 to build confidence, followed by Advanced Set 02 for exam excellence.
Frequently Asked Questions & Model Answers:
Q1 How should students prepare for d and f Block Elements exams?
Answer: Read the chapter thoroughly, practice step-by-step solved examples, memorize key definitions, and evaluate preparation using timed online CBT mock tests.

Sample Questions Preview

Free Sneak Peek

Here is a sneak peek of the questions included in this test set. Test your preparation by viewing the answer and detailed explanation before starting the timed exam.

Q1
Why do Zirconium (Zr, 4d series, radius 160 pm) and Hafnium (Hf, 5d series, radius 159 pm) have ALMOST IDENTICAL atomic and ionic radii?
জিরকোনিয়াম (Zr) এবং হ্যাফনিয়াম (Hf) মৌলদ্বয়ের পারমাণবিক ও আয়নীয় ব্যাসার্ধ প্রায় সম্পূর্ণ সমান হওয়ার কারণ কী?
ज़िरकोनियम (Zr, 4d श्रृंखला, त्रिज्या 160 pm) और हेफ़नियम (Hf, 5d श्रृंखला, त्रिज्या 159 pm) की परमाणु और आयनिक त्रिज्या लगभग समान क्यों हैं?
A
Because they are isotopesকারণ এরা আইসোটোপक्योंकि वे आइसोटोप हैं
B
Because they are in the same periodকারণ এরা একই পর্যায়ে অবস্থিতक्योंकि वे एक ही कालखंड में हैं
C
Due to LANTHANOID CONTRACTION intervening between the 4d and 5d series (filling of 4f subshell), which exactly cancels the expected size increase down the group4d ও 5d সারির মাঝে ১৪টি 4f ইলেকট্রনের দুর্বল আবরণী দ্বারা সৃষ্ট ল্যান্থানয়েড সংকোচনের জন্যलैंथेनॉइड संकुचन के कारण 4d और 5d श्रृंखला (4f उपकोश भरना) के बीच हस्तक्षेप होता है, जो समूह के नीचे अपेक्षित आकार में वृद्धि को बिल्कुल रद्द कर देता है
D
Because they have zero valence electronsকারণ এদের যোজ্যতা ইলেকট্রন নেইक्योंकि उनमें शून्य वैलेंस इलेक्ट्रॉन होते हैं
Correct Answer: Option C
Explanation:
Filling of 14 4f electrons before 5d Hf causes a sharp contraction in atomic radius, perfectly cancelling the normal increase from 4d to 5d, giving Zr and Hf identical chemical properties.
4f ইলেকট্রনগুলির ল্যান্থানয়েড সংকোচন গ্রুপ বরাবর স্বাভাবিক আকার বৃদ্ধিকে নাকচ করে দেয়, ফলে Zr ও Hf-এর আকার সমান হয়।
5d Hf से पहले 14 4f इलेक्ट्रॉन भरने से परमाणु त्रिज्या में तेज संकुचन होता है, जो 4d से 5d तक की सामान्य वृद्धि को पूरी तरह से रद्द कर देता है, जिससे Zr और Hf को समान रासायनिक गुण मिलते हैं।
Q2
Why does Cu⁺ ion undergo DISPROPORTIONATION in aqueous solution (2Cu⁺ ⟶ Cu^2⁺ + Cu), even though Cu⁺ has a stable filled 3d^{10} configuration?
জলীয় দ্রবণে Cu⁺ আয়নের 3d^{10} সুস্থিত বিন্যাস থাকা সত্ত্বেও এটি কেন স্বতঃস্ফূর্তভাবে অসামঞ্জস্য বিক্রিয়ায় (Disproportionation) Cu^2⁺ ও Cu-তে রূপান্তরিত হয়?
Cu⁺ आयन जलीय घोल (2Cu⁺ ⟶ Cu^2⁺ + Cu) में अनुपातहीन क्यों होता है, भले ही Cu⁺ में स्थिर भरा 3d^{10} विन्यास हो?
A
The much higher HYDRATION ENTHALPY of Cu^2⁺ (due to higher charge density) overcompensates for the second ionization energy of copperউচ্চ আধান ঘনত্বের কারণে Cu^2⁺ আয়নের অনেক বেশি হাইড্রেশন এনথ্যালপি দ্বিতীয় আয়নায়ন শক্তিকে অতিক্রম করে এটিকে জলে সুস্থিত করেCu^2⁺ की बहुत अधिक हाइड्रेशन एन्थैल्पी (उच्च चार्ज घनत्व के कारण) तांबे की दूसरी आयनीकरण ऊर्जा की अधिक भरपाई करती है
B
Cu⁺ is a noble gasCu⁺ একটি নিষ্ক্রিয় গ্যাসCu⁺ एक उत्कृष्ट गैस है
C
Cu^2⁺ is a solid metalCu^2⁺ একটি কঠিন ধাতুCu^2⁺ एक ठोस धातु है
D
Water oxidizes all metalsজল সমস্ত ধাতুকে জারিত করেजल सभी धातुओं का ऑक्सीकरण करता है
Correct Answer: Option A
Explanation:
In aqueous solution: 2Cu⁺(aq) ⟶ Cu^2⁺(aq) + Cu(s) (E° = +0.37 V). Although Cu^2⁺ is d^9, its large negative hydration energy (-2121 kJ/mol vs -593 kJ/mol for Cu⁺) drives disproportionation.
জলে Cu^2⁺-এর হাইড্রেশন এনথ্যালপি অনেক বেশি ঋণাত্মক হওয়ায় জলীয় মাধ্যমে Cu^2⁺ আয়ন Cu⁺ অপেক্ষা অধিকতর সুস্থিত হয়।
जलीय घोल में: 2Cu⁺(aq) ⟶ Cu^2⁺(aq) + Cu(s) (E° = +0.37 V)। यद्यपि Cu^2⁺ d^9 है, इसकी बड़ी नकारात्मक जलयोजन ऊर्जा (-2121 kJ/mol बनाम Cu⁺ के लिए -593 kJ/mol) अनुपातहीनता को प्रेरित करती है।

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How Chapter-Wise Online CBT Tests Build Winning Habits for Future Competitive Exams

Focused chapter-wise CBT practice builds the speed, mental stamina, and analytical discipline required to ace CUET, JEE Main, NEET UG, NDA, CA Foundation, and College Entrance Exams.

Competitive Edge

Real-Time Clock Awareness & Pacing

समय प्रबंधन एवं गति नियंत्रण

In school examinations, students write answers without active pacing. In national entrance tests, students have barely 45-60 seconds per MCQ. Practicing with a 20-minute timer instills instinctive time-budgeting and prevents last-minute exam panic.

Mastery of the Elimination Technique

विकल्प निष्कासन विधि में दक्षता

Top rankers in competitive exams rarely compute every problem blindly. They spot subtle traps, evaluate extreme values, and eliminate 2 out of 4 distractors within seconds. Our 4-option sets teach critical distractor analysis.

CBT Screen Stamina & Digital Comfort

कंप्यूटर आधारित परीक्षा का सहज अभ्यास

Almost all major national exams (CUET, JEE, NEET, SSC, Banking) are 100% computer-based. Students who only study on paper experience eye strain and navigation mistakes on exam day. Early CBT practice creates effortless digital fluency.

Immunity to Negative Marking

सटीकता और नकारात्मक अंकन से सुरक्षा

Careless errors—such as misreading "NOT" or "EXCEPT"—ruin thousands of competitive aspirations each year. Regular objective testing builds the habit of double-checking question keywords before locking answers.

Instant Diagnostic Feedback Loop

तत्काल त्रुटि निवारण एवं आत्म-मूल्यांकन

Traditional paper tests take weeks to grade, by which time the student has forgotten their thought process. TargetExams provides instant scorecards and step-by-step solutions while the conceptual puzzle is still fresh.

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Syllabus Concepts Evaluated in this Chapter

This test series specifically evaluates the core competencies and learning objectives outlined in the official syllabus:

  • Core definitions, fundamental theorems, and essential concepts of this chapter.
  • Step-by-step mathematical reasoning and deductive problem-solving.
  • Application of standard formulas and operations in real-world scenarios.
  • Critical examination of common exam pitfalls and misleading options.
  • Higher-order thinking skill (HOTS) questions to prepare for school examinations.
  • Speed and accuracy mastery under standard timed CBT exam conditions.

Exam Rules & Test Taking Guidelines

  • Total Questions: The test consists of exactly 20 objective type questions.
  • Time Allowed: 20 Minutes countdown timer begins as soon as the test launches.
  • Marking Scheme: +1.0 mark is awarded for each correct answer.
  • Zero Penalty: There is 0.0 negative marking for incorrect or unattempted questions.
  • Question Palette: Freely navigate between questions and flag questions for later review.
  • Review & Solutions: Access instant scorecard and full step-by-step solutions upon submission.

Frequently Asked Questions (FAQs)

Yes! Foundation Practice Set 01 for every chapter in West Bengal Council of Higher Secondary Education (WBCHSE) Class 12 (Higher Secondary) Chemistry is 100% free to attempt. Students can test their preparation without any subscription or payment.
This test strictly follows the official West Bengal Council of Higher Secondary Education (WBCHSE) syllabus and curriculum for Class 12 (Higher Secondary), covering textbook concepts, formulas, and board-standard MCQs for Chapter 9.
This dedicated test page is conducted in English Medium. If you prefer taking the test in Bengali or Hindi, you can switch using the language switcher bar at the top or toggle languages during the exam.
The test comprises 20 MCQs to be completed in 20 minutes. Each question carries +1.0 mark for a correct response, and there is 0.0 negative marking for incorrect or unattempted questions.
Yes! Instantly after submitting your test, you receive a comprehensive digital scorecard with accuracy analysis, time breakdown, and step-by-step verified explanations for all 20 questions.

Practice Sets in this Chapter

Set 01 (Foundation)

20 MCQs • 20 Mins
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Set 02 (Advanced)

20 MCQs • 20 Mins
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More Chapters in this Subject

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d and f Block Elements (Set 02 (Advanced Level))
20 MCQs • 20 Mins • 100% Free Practice Test

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