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NATIONAL OPEN UNIVERSITY OF NIGERIA 14/16 AHMADU BELLO WAY, VICTORIA ISLAND, LAGOS SCHOOL OF SCIENCE AND TECHNOLOGY OCTOBER 2013 EXAMINATION Course Code: CHM 303: Course Title: INORGANIC CHEMISTRY III Time: 2?2 Hours INSTRUCTION: Answer any four Questions

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1. Familiarity with Exam Format: Past exam questions help students understand the structure and format of the exams they will be facing. This familiarity reduces anxiety and allows students to focus more on the content rather than the logistics of the exam.
2. Identifying Key Topics: By reviewing past questions, students can identify recurring themes or topics that are frequently tested. This helps them prioritize their studying efforts and focus on areas that are more likely to appear on the exam.
3. Practice with Time Management: Exams typically have time constraints, and practicing past questions allows students to practice managing their time effectively. They can learn how much time to allocate to each question and practice pacing themselves during the exam.
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6. Building Confidence: Successfully answering past exam questions builds confidence in students' ability to tackle similar questions in the actual exam. It validates their preparation and helps alleviate exam-related stress.
7. Improving Exam Technique: Practicing past questions helps students refine their exam technique, such as how to interpret questions, structure their answers effectively, and ensure they address all parts of the question.

Using our past exam questions is a practical and effective study strategy that enhances preparation, builds confidence, and improves performance in exams by providing focused practice and valuable feedback.

NATIONAL OPEN UNIVERSITY OF NIGERIA 14/16 AHMADU BELLO WAY, VICTORIA ISLAND, LAGOS SCHOOL OF SCIENCE AND TECHNOLOGY OCTOBER 2013 EXAMINATION Course Code: CHM 303: Course Title: INORGANIC CHEMISTRY III Time: 2?2 Hours INSTRUCTION: Answer any four Questions 1. a) i. State the principal sources of Ne, Ar and Xe and how these elements can be obtained. (3 marks) ii. Why do the noble gases have the highest ionization energies compared to other elements in their respective periods? (3 marks) b) i. The noble gases are chemically unreactive but chemical reactivity of the noble gases increase as we go down the group from helium to radon.Explain. (5 marks) ii. State two uses of helium. (3 marks) 2. a) i. Write an equation representing the reaction between xenon and fluorine at 700k, 6 atm. (3 marks) ii. What kind of compound is formed between quinol and the noble gases Ar, Kr or Xe under pressure of 10-40 atmospheres . How do Ar, Kr or Xe bind to quinol to form this compound? (4 marks) b) i. Account for the structure of XeF4 according to the valence bond theory. (5 marks) ii. State 2 uses of hydrogen. (2 marks) 3. a) i. What is the difference between beryllium oxide( BeO) and oxides of the other elements of Group II. (4 marks) ii. Why is it that, unlike group I and II (with the exception of Be), Group IIIB elements are essentially covalent or contain an appreciable amount of covalent character?. (3 marks) b) i. Name the elements with which boron reacts, and the compounds formed. (4 marks) ii. How do the elements of Group IVA make more than four covalent bonds (carbon excluded). (3 marks) 4. a) i. What properties or characteristics of Group VA element make them exhibit properties of non-metals? (3 marks) ii. What kind of oxides are formed when oxygen reacts with; (2 marks) -Group I and II metals -Sulphur and Phosphorus b) i. Write chemical reactions to show the difference in the products formed when chlorine and fluorine react with water. (2 marks) ii. Write the electronic configuration of the dipositive ion of Copper. (4 marks) c) With the exception of Beryllium, Group IIA elements are good reducing agents and give ionic compound. Discuss (4 marks) 5. a) i. State two characteristics of transition elements. (3 marks) ii. What is the main source of helium and how is it obtained from this source. (4 marks ) b) Discuss the trend in ionization energy going from the transition series Sc to Zn. (7 marks) p.t.o 6. a) i. What do you understand by the term “lanthanide contraction” ?. (6 marks) ii. Identify the most stable state for lanthanides.(2 marks) b) Why are the compounds of Sc3+, Ti4+ and Zn2+ white or colourless. (6 marks) 7. a) i. What is a coordination compound? (3 marks) ii. Coordination compounds are said to be lewis adduct. Explain. (5 marks) b) i. What is Beneficiation of ores? (3 marks) ii. State the methods of beneficiation of ores. (3 marks)

National Open University of Nigeria (NOUN) 

 Overview: 

The National Open University of Nigeria (NOUN) is Nigeria's foremost open and distance learning institution. Established in 1983 but suspended until 2002, NOUN was re-launched with a mission to provide flexible, accessible, and quality education to Nigerians. It operates under the auspices of the National Universities Commission (NUC) and offers a wide range of undergraduate and postgraduate programs across various disciplines. 

Mission and Vision: 

 Mission: To provide affordable, flexible, and high-quality education to all Nigerians, leveraging open and distance learning methodologies.
Vision: To be the foremost institution providing accessible and quality education through open and distance learning in Nigeria and beyond. 

Key Features and Distinctions:

Open and Distance Learning (ODL) Model: NOUN operates primarily through distance learning methods, allowing students to study from any location and at their own pace. This flexibility caters to working professionals, adults seeking education, and individuals unable to attend traditional on-campus programs. 

Programs and Accreditation: NOUN offers a wide array of undergraduate and postgraduate programs in fields such as Arts, Social Sciences, Management Sciences, Health Sciences, Education, Law, and Agricultural Sciences. All programs are accredited by the NUC, ensuring they meet national educational standards.

Admission and Enrollment: Admission into NOUN is open to all qualified individuals, irrespective of their educational background or location. Prospective students apply online and are admitted based on the fulfillment of specified entry requirements for each program. 

 Learning Resources and Support: The university provides robust learning resources and support services tailored for distance learners. This includes online course materials, virtual classrooms, academic counseling, and access to physical study centers across Nigeria.

Examinations and Assessment: Students participate in periodic examinations conducted at designated centers nationwide. Assessments may include assignments, quizzes, and final examinations, all designed to evaluate students' understanding and mastery of course materials. 

Research and Development: NOUN promotes research and scholarly activities among its faculty and students, contributing to knowledge creation and dissemination in various academic disciplines.

Community and Outreach: Beyond academic pursuits, NOUN is committed to community engagement and outreach initiatives aimed at promoting educational opportunities and societal development. 

Accolades and Recognition:
NOUN has earned recognition both nationally and internationally for its pioneering efforts in open and distance learning, contributing significantly to the democratization of education in Nigeria. 

Future Directions:
Moving forward, NOUN continues to expand its program offerings, enhance its learning technologies, and strengthen its academic partnerships to further its mission of providing accessible and quality education to Nigerians. 

Conclusion:
The National Open University of Nigeria (NOUN) stands as a beacon of open and distance learning in Nigeria, offering flexible educational opportunities that cater to the diverse needs of its student population. With its commitment to quality, accessibility, and innovation, NOUN plays a vital role in shaping the educational landscape of Nigeria and beyond.