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Class 12 Chemistry NCERT Exemplar Solutions: Chapter 9, Coordination Compounds

Sep 25, 2018 10:47 IST
    Coordination Compounds: NCERT Exemplar Solutions
    Coordination Compounds: NCERT Exemplar Solutions

    Coordination compound is a compound or ion with a central metallic atom or ion combined by coordinate bonds with a definite number of surrounding ions, groups or molecules. Such compound is also termed as a coordination complex. Term complex is used to indicate something that consists of a metal atom or ion in the center, surrounded by ligands (an ion or molecule capable of donating a pair of electrons to the central atom). Class 12 NCERT chapter, Coordination Compounds explains the chemistry of such complexes including their nomenclature, structures and properties.

    Class 12 Chemistry NCERT Exemplar Problems: Coordination Compounds

    In the NCERT Exemplar for class 12 Chemistry chapter - Coordination Compounds, there are given some higher order thinking skill questions which are designed to test a student's analytical approach to the concepts explained in this chapter.

    In this article, we are providing the precise and comprehensive solutions to all the NCERT Exemplar problems for Class 12 Chemistry chapter - Coordination Compounds. All the questions have been solved in the most appropriate and simple way so as to help students access the right study material for exam preparation.

    All the class 12 Chemistry NCERT Exemplar solutions have been collated in PDF format which students may easily download for absolutely free. 

    Few problems along with their solutions from this chapter are given below:

    Q. When 1 mole of CrCl3.6H2O is treated with excess of AgNO3, 3 moles of AgCl are obtained. The formula of the complex is

    (a) [CrCl3(H2O)3].3H2O                                    (b) CrCl2(H2O)4]Cl.2H2O

    (c) [CrCl(H2O)5]Cl2.H2O                                   (d) [Cr(H2O)6]Cl3

    Ans. (d) [Cr(H2O)6]Cl3 

    AgNO3 precipitates one free chloride ion (CP).

    Here, 3 moles of AgCl are precipitated by excess of AgNO3. Hence, there must be three free Cl- ions.

    So, the formula of the complex can be [Cr(H2O)6]Cl3 and correct choice is (d).

    CBSE Class 12 Chemistry Syllabus 2018 – 2019

    Q. Due to the presence of ambidentate ligands coordination compounds show isomerism. Palladium complexes of the type [Pd(C6H5)2(SCN)2] and [Pd(C6H5)2(NCS)2] are

    (a) linkage isomers          (b) coordination isomers

    (c) ionisation isomers     (d) geometrical isomers

    Ans. (a) linkage isomers

    The ligand(s) which has two different bonding sites are known as ambident ligands e.g., NCS,NO2 etc.

    Here, NCS has two binding sites at N and S.

    Hence, NCS (thiocyanate) can bind to the metal ion in two ways

    M ¬NCS or M → SNC

    Thus, coordination compounds containing NCS as a ligand can show linkage isomerism i.e.,[Pd(C6h5)2(SCN) and [Pd(C6H5)2(NCS)2]are linkage isomers.

    Hence, correct choice is (a).

    Q. A coordination compound CrCl3.4H2O precipitates silver chloride when treated, with silver nitrate. The molar conductance of its solution corresponds to a total of two ions. Write structural formula of the compound and name it.

    Ans. Formation of white precipitate with AgNO3 shows that atleast one Cl- ion is present outside the coordination sphere. Moreover only two ions are obtained in solution, so only one Cl- present outside the sphere.  Thus, the formula of the complex is [Co(H2O)4Cl2]Cl and its IUPAC name is Tetraaquadichloridocobalt (III) chloride.

    Q. CuSO4. 5H2O is blue in colour while CuSO4 is colourless. Why?

    Ans. In CuSO4.5H2O, water acts as ligand and causes crystal field splitting. Hence, d-d transition is possible thus CuSO4. H2O is coloured. On the other hand, in the anhydrous CuSO4 due to the absence of water (ligand), crystal field splitting is not possible and hence, it is colourless.

    Find below the links to download Class 12 Chemistry NCERT Exemplar Solutions for chapter 9- Coordination Compounds:

    Questions

    Link to Download Solutions

    Multiple Choice Questions (Type-I)

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    Multiple Choice Questions (Type-II)

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    Short Answer Type Questions

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    Matching Columns Type Questions

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    Assertion and Reason Type Questions

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    Long answer types questions

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    Class 12 Chemistry NCERT Solutions: All Chapters

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    Class 12 Chemistry NCERT Exemplar Problems: Coordination Compounds

    NCERT Exemplar book for class 12 Chemistry consists of a collection of conceptual questions which are designed purely to check a student’s understanding about the various concepts and theories explained in the subject. These problems form the best practice source to prepare effectively for board exams and the medical entrance tests. So, it’s very important for students to practice the NCERT exemplar problems to prepare well for the boards and the competitive exams.

    In this article, we are providing the NCERT Exemplar Problems for Class 12 Chemistry chapter – Coordination Compounds, in the PDF format which students may download and solve them to analyse their preparedness for the exams.

    Important topics discussed in Class 12 Chemistry chapter – Coordination Compounds, are:

    • Werner’s theory of coordination compounds
    • Definitions of some important terms pertaining to coordination compounds
    • Nomenclature of coordination compounds
    • Isomerism in coordination compounds
    • Bonding in coordination compounds
    • Bonding in metal carbonyls
    • Stability of coordination compounds
    • Importance and applications of coordination compounds. 

    Download the complete NCERT Exemplar problems from the following link:

    Class 12 Chemistry NCERT Exemplar Problems: Coordination Compounds

    To get more of such important articles for class 12 board exams preparation, click here.

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