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National Institute of Open Schooling (NIOS)
Class XII
Chemistry (313)
Coordination Compounds (Set 01 (Foundation Level))

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National Institute of Open Schooling (NIOS) Class XII Chemistry (313) Set 01 (Foundation Level) English Medium 100% Free Practice Test

National Institute of Open Schooling (NIOS) Class XII Chemistry (313): Coordination Compounds Online Test (Set 01 (Foundation Level)) | TargetExams

Coordination Compounds — Set 01 (Foundation Level)

Take free online mock test for National Institute of Open Schooling (NIOS) Class XII Chemistry (313) chapter 'Coordination Compounds'. 20 MCQs, 20 minutes, detailed solutions & score analysis.

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20 MCQs

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20 Mins

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20 Marks

Total Marks

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Per Correct

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0.0

Negative Mark

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English

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Instant Scorecard Step-by-Step Solutions NIOS Self-Learning Material (SLM) 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: Coordination Compounds

Class 12 Study Guide

Mastering Coordination Compounds 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 Coordination Compounds.	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 Coordination Compounds 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.

According to Werner's coordination theory, which of the following statements correctly distinguishes between the primary valency and secondary valency of a central metal ion?

वर्नर के उपसहसंयोजन सिद्धांत (Werner's coordination theory) के अनुसार, निम्नलिखित में से कौन सा कथन एक केंद्रीय धातु आयन की प्राथमिक संयोजकता और द्वितीयक संयोजकता के बीच सही अंतर करता है?

Primary valency is ionizable, non-directional, and corresponds to the oxidation state; secondary valency is non-ionizable, directional in space, and corresponds to the coordination numberप्राथमिक संयोजकता आयननीय, अदिशीय होती है और ऑक्सीकरण अवस्था से मेल खाती है; द्वितीयक संयोजकता गैर-आयननीय, अंतरिक्ष में दिशीय होती है और उपसहसंयोजन संख्या से मेल खाती है

Primary valency determines the spatial geometry of the complex, while secondary valency is satisfied solely by cationsप्राथमिक संयोजकता संकुल की स्थानिक ज्यामिति निर्धारित करती है, जबकि द्वितीयक संयोजकता केवल धनायनों द्वारा संतुष्ट होती है

Both primary and secondary valencies are completely non-ionizable and non-directionalप्राथमिक और द्वितीयक दोनों संयोजकताएं पूरी तरह से गैर-आयननीय और अदिशीय होती हैं

Secondary valency is ionizable and satisfied exclusively by halide anions outside the coordination sphereद्वितीयक संयोजकता आयननीय होती है और उपसहसंयोजन क्षेत्र के बाहर विशेष रूप से हैलाइड ऋणायनों द्वारा संतुष्ट होती है

Correct Answer: Option A

Explanation:

Alfred Werner postulated that metals exhibit two types of valencies in coordination complexes: (1) Primary valency: ionizable, non-directional, satisfied only by negative ions, and corresponds to the formal oxidation state of the metal. (2) Secondary valency: non-ionizable, directional towards fixed positions in space (dictating stereochemistry/geometry), satisfied by neutral molecules or negative ions, and corresponds to the coordination number.

अल्फ्रेड वर्नर ने प्रतिपादित किया कि धातुएं उपसहसंयोजन संकुलों में दो प्रकार की संयोजकताएं प्रदर्शित करती हैं: (1) प्राथमिक संयोजकता: आयननीय, अदिशीय, केवल ऋणात्मक आयनों द्वारा संतुष्ट, और धातु की औपचारिक ऑक्सीकरण अवस्था से मेल खाती है। (2) द्वितीयक संयोजकता: गैर-आयननीय, अंतरिक्ष में निश्चित पदों की ओर दिशीय (त्रिविम रसायन/ज्यामिति निर्धारित करती है), उदासीन अणुओं या ऋणात्मक आयनों द्वारा संतुष्ट, और उपसहसंयोजन संख्या से मेल खाती है।

When one mole of the coordination compound $CoCl_3 cdot 5NH_3$ is treated with excess silver nitrate ($AgNO_3$) solution, exactly two moles of silver chloride ($AgCl$) precipitate. What is the formulation of the complex and how many total ions does one formula unit produce in aqueous solution?

जब उपसहसंयोजन यौगिक $CoCl_3 cdot 5NH_3$ के एक मोल को आधिक्य सिल्वर नाइट्रेट ($AgNO_3$) विलयन के साथ उपचारित किया जाता है, तो ठीक दो मोल सिल्वर क्लोराइड ($AgCl$) अवक्षेपित होते हैं। संकुल का सूत्र क्या है और एक सूत्र इकाई जलीय विलयन में कुल कितने आयन उत्पन्न करती है?

$[Co(NH_3)_6]Cl_3$, producing 4 ions$[Co(NH_3)_6]Cl_3$, जो 4 आयन उत्पन्न करता है

$[Co(NH_3)_5Cl]Cl_2$, producing 3 ions (one complex cation and two chloride anions)$[Co(NH_3)_5Cl]Cl_2$, जो 3 आयन उत्पन्न करता है (एक संकुल धनायन और दो क्लोराइड ऋणायन)

$[Co(NH_3)_4Cl_2]Cl$, producing 2 ions$[Co(NH_3)_4Cl_2]Cl$, जो 2 आयन उत्पन्न करता है

$[Co(NH_3)_5Cl_2]Cl$, producing 1 ion$[Co(NH_3)_5Cl_2]Cl$, जो 1 आयन उत्पन्न करता है

Correct Answer: Option B

Explanation:

The precipitation of 2 moles of $AgCl$ per mole of complex indicates that exactly 2 chloride ions reside in the outer ionization sphere. The remaining 1 chloride ion and 5 ammonia molecules are directly coordinated to the cobalt ion in the coordination sphere to satisfy a secondary valency of 6: $[Co(NH_3)_5Cl]Cl_2$. In water, it dissociates as: $[Co(NH_3)_5Cl]Cl_2(aq) ightarrow [Co(NH_3)_5Cl]^{2+} + 2Cl^-$, generating a total of 3 ions (1:2 electrolyte).

संकुल के प्रति मोल 2 मोल $AgCl$ का अवक्षेपण इंगित करता है कि ठीक 2 क्लोराइड आयन बाहरी आयनन क्षेत्र में रहते हैं। शेष 1 क्लोराइड आयन और 5 अमोनिया अणु 6 की द्वितीयक संयोजकता को संतुष्ट करने के लिए उपसहसंयोजन क्षेत्र में कोबाल्ट आयन से सीधे समन्वित होते हैं: $[Co(NH_3)_5Cl]Cl_2$। पानी में, यह इस प्रकार वियोजित होता है: $[Co(NH_3)_5Cl]Cl_2(aq) ightarrow [Co(NH_3)_5Cl]^{2+} + 2Cl^-$, जिससे कुल 3 आयन (1:2 विद्युत-अपघट्य) उत्पन्न होते हैं।

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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.

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 National Institute of Open Schooling (NIOS) Class XII Chemistry (313) is 100% free to attempt. Students can test their knowledge without any payment or hidden fees.

This page is dedicated to English Medium. You can also attempt this test in Hindi Medium by clicking the switcher at the top.

Absolutely. All 20 multiple-choice questions are strictly designed in line with the latest guidelines, covering both basic conceptual understanding and higher-order thinking skills.

The test contains 20 MCQs to be solved in 20 minutes. Each question carries +1.0 mark for a correct answer, and there is zero (0.0) negative marking for incorrect answers.

Yes. Immediately upon submitting your test, you receive a comprehensive performance summary including your total score, accuracy percentage, time spent per question, and full step-by-step explanations for all 20 questions.

Coordination Compounds (Set 01 (Foundation Level))

20 MCQs • 20 Mins • 100% Free Practice Test

National Institute of Open Schooling (NIOS) Class XII Chemistry (313): Coordination Compounds Online Test (Set 01 (Foundation Level)) | TargetExams

Chapter Study Guide & In-Depth Notes

Chapter Overview & Core Concepts: Coordination Compounds