5. Coordination Compounds
इस पेज पर आपको 5. Coordination Compounds के सभी महत्वपूर्ण बहुविकल्पीय प्रश्न (MCQ), परीक्षा उपयोगी नोट्स और ऑनलाइन क्विज़ मिलेंगे। अपने ज्ञान का परीक्षण करने और बोर्ड/प्रतियोगी परीक्षा में शत-प्रतिशत अंक प्राप्त करने के लिए नीचे दिए गए मॉक टेस्ट में अवश्य भाग लें।
👉 अध्याय का सारांश (Summary)
Dear students, in this chapter, we will embark on an exciting journey into a fascinating and practical branch of chemistry known as 'Coordination Compounds'. This branch introduces us to a completely new and unique behavior of transition metals. While you have read about simple salts in your previous classes, coordination chemistry is different. When 2 or more stable chemical compounds combine to form a complex molecular structure that firmly retains its distinct identity in the solid crystalline state and in an aqueous solution, it is called a coordination compound. This unique stability makes them extremely important.
Science is never just confined to the laboratory; it thrives in our daily lives and deep within our own bodies. Have you ever wondered why human blood is bright red? The essential red pigment present in our blood is hemoglobin, which is actually a highly vital coordination compound of the transition metal iron. It binds with oxygen and transports it throughout our body. Similarly, the green pigment chlorophyll, which miraculously allows green plants to prepare their food through photosynthesis, is a naturally occurring complex compound of magnesium. Vitamin B12, essential for the proper functioning of our nervous system, is a complex coordination compound of cobalt. In the modern medical field, these compounds have life-saving applications; for instance, 'Cisplatin' is a famous coordination compound of platinum used extensively in hospitals to treat and stop the growth of tumors in cancer patients.
From the strict perspective of your upcoming NCERT and RBSE board exams, this chapter is extremely crucial and highly scoring. Board examiners consistently ask conceptual questions based on IUPAC nomenclature, isomerism, and the precise geometry of these complexes. We will systematically begin our detailed study by understanding Alfred Werner's Theory, who is rightly considered the undisputed father of coordination chemistry. He was the very first scientist to accurately propose that central metal ions in these complexes exhibit 2 completely different types of valencies: primary and secondary valencies.
Moving further into the chapter, we will deeply explore the fundamental concept of a ligand. Ligands are the specific atoms, ions, or molecules that donate their lone pairs of electrons to the central metal atom, forming a strong coordinate covalent bond. You will practice the strict but highly logical rules of IUPAC nomenclature for these complex compounds. Mastering these naming rules is necessary, as 1 or 2 direct nomenclature questions are guaranteed to appear in your final examinations. We will also analyze the Valence Bond Theory, which helps us predict the geometric shapes of these complexes, such as tetrahedral, square planar, or octahedral structures, and determine whether they are paramagnetic or diamagnetic.
Furthermore, learning the Crystal Field Theory feels almost like uncovering true scientific magic. This theory provides the exact, logical, and scientific reasons explaining why these coordination compounds exhibit such beautiful and vibrant colors in solutions. Understanding the crystal field splitting of d-orbitals under the influence of various ligands will make your conceptual foundation incredibly strong.
To ensure your excellent preparation, we have carefully selected these accurate objective questions. They will clear your concepts and boost your solving speed.
Feature: This is a unique 3-Level based quiz. To unlock the next level (Level 2 and 3), students must score at least 70% in the current level, which makes their board exam preparation 100% strong.
अध्याय के सभी प्रश्न (Revision Notes)
*नोट: यह सेक्शन रिवीजन के लिए है। अपना ज्ञान परखने के लिए ऊपर दिए गए क्विज़ में भाग लें।
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Secondary valency is .................. than primary valency.
A) Stronger | B) Weaker | C) Equal | D) None -
Who behaves as a Lewis acid by accepting an electron pair?
A) Ligand | B) Central metal atom | C) Ionization sphere | D) Coordination entity -
The part of the complex compound kept inside the square brackets [ ] is called?
A) Ligand | B) Central metal atom | C) Coordination entity | D) Counter ion -
Coordination sphere can be?
A) Neutral | B) Positively charged | C) Negatively charged | D) All of the above -
The number of donor atoms present in a ligand is called its?
A) Denticity | B) Coordination number | C) Oxidation number | D) Isomerism -
What is the denticity of EDTA?
A) 2 | B) 4 | C) 5 | D) 6 -
Which element is present as the central metal atom in Vitamin B12?
A) Fe | B) Co | C) Ni | D) Mg -
Hemoglobin, the oxygen carrier in the body, is a complex of which element?
A) Fe | B) Ni | C) Mg | D) Cr -
Cis-trans isomerism is a type of which isomerism?
A) Optical | B) Ionization | C) Geometrical | D) Linkage -
What is the full form of CFSE?
A) Crystal Field Splitting Energy | B) Crystal Field Spin Energy | C) Crystal Field Pairing Energy | D) Complex Field Splitting Energy -
The ionization sphere in Potassium ferrocyanide [K4[Fe(CN)6]] is?
A) K⁺ | B) Fe | C) CN | D) [Fe(CN)6] -
Which of the following is not a chelate ligand?
A) en | B) ox | C) EDTA | D) CO -
Secondary valency is equal to?
A) Coordination number | B) Oxidation number | C) Ionization number | D) None -
Mohr's Salt is an example of?
A) Complex salt | B) Double salt | C) Neutral salt | D) None -
What is the oxidation number of Ni in the complex [Ni(CO)4]?
A) 0 | B) +1 | C) +2 | D) +4 -
What is the IUPAC name of Ammonia (NH3) ligand?
A) Amine | B) Ammine | C) Ammonium | D) Nitrogen -
Chlorophyll is a complex compound of which metal?
A) Fe | B) Co | C) Mg | D) Zn -
On the basis of donor atoms, what type of ligand is NH3?
A) Monodentate | B) Bidentate | C) Polydentate | D) Ambidentate -
An example of a Double Salt is?
A) Alum | B) K4[Fe(CN)6] | C) Ni(CO)4 | D) Ag(NH3)2Cl -
The geometry of complexes with coordination number 6 is?
A) Tetrahedral | B) Octahedral | C) Square planar | D) Pyramidal -
Optical isomerism is found in?
A) Tetrahedral with bidentate | B) Square planar with bidentate | C) Octahedral with bidentate | D) All of the above -
An example of a bidentate ligand among the following is?
A) Chlorido | B) Bromido | C) Oxalato | D) Ammine -
Which of the following is not an ambidentate ligand?
A) CN | B) SCN | C) NO2 | D) NH3 -
The compounds [Co(NH3)5Br]SO4 and [Co(NH3)5SO4]Br are examples of?
A) Ionization isomerism | B) Linkage isomerism | C) Hydrate isomerism | D) Optical isomerism -
Geometrical isomerism is not found in tetrahedral complexes because?
A) Relative positions are same | B) Ligands are close | C) Ligands are identical | D) All of the above -
Which of the following is a strong ligand?
A) Carbonyl (CO) | B) Aqua (H2O) | C) Chlorido (Cl) | D) Hydrazo -
What is the formula of Wilkinson's catalyst?
A) [(PH3)3RhCl] | B) [(PPh3)3RhCl] | C) [(NH3)3RhCl] | D) [(PNH3)3RhCl] -
If Splitting energy (Δo) > Pairing energy (P), what will happen?
A) Pairing will occur | B) Pairing will not occur | C) CFSE will be zero | D) No effect -
What type of ligand is Ethane-1,2-diamine?
A) Monodentate | B) Bidentate | C) Chelating | D) Both B and C -
An example of a heteroleptic complex is?
A) [Fe(CN)6]⁴⁻ | B) [Co(NH3)6]³⁺ | C) [Co(NH3)4Cl2]⁺ | D) [Ni(CN)4]²⁻ -
What is the coordination number of Cr in the complex [Cr(en)3]Cl3?
A) 3 | B) 4 | C) 5 | D) 6 -
How many ions will one complex [Co(NH3)5Cl]Cl2 give in water?
A) 1 | B) 3 | C) 4 | D) 6 -
The denticity of ambidentate ligands is generally?
A) 1 | B) 2 | C) 3 | D) 4 -
Which of the following ions does not form complex compounds?
A) Na⁺ | B) Cr³⁺ | C) Co²⁺ | D) Fe²⁺ -
In an octahedral field, electrons first fill in which orbitals?
A) eg | B) t2g | C) dz² | D) dx²-y² -
Which of the following is a polynuclear complex?
A) Fe2(CO)9 | B) Co2(CO)8 | C) Mn2(CO)10 | D) All of the above -
Which will be the most stable complex of iron (chelate effect)?
A) [Fe(H2O)6]³⁺ | B) [Fe(NH3)6]³⁺ | C) [Fe(C2O4)3]³⁻ | D) [FeCl6]³⁻ -
Which form of geometrical isomerism is optically active?
A) Cis | B) Trans | C) Both | D) None -
The spectrochemical series of ligands is based on?
A) Splitting energy | B) Mass | C) Size | D) Color -
Which of the following will form the most stable complex?
A) Cu²⁺ | B) Co²⁺ | C) Fe²⁺ | D) Mn²⁺ -
What is the geometry and nature of the complex [NiCl4]²⁻?
A) Tetrahedral, paramagnetic | B) Square planar, diamagnetic | C) Octahedral, paramagnetic | D) Tetrahedral, diamagnetic -
What is the number of unpaired electrons in the complex [Fe(CN)6]³⁻?
A) 0 | B) 1 | C) 2 | D) 3 -
What is the type of hybridization in the complex [Co(NH3)6]³⁺?
A) sp³d² | B) d²sp³ | C) dsp² | D) sp³ -
NiCl2.6H2O gives 2 moles of AgCl with AgNO3. Its formula is?
A) [Ni(H2O)6Cl]Cl | B) [Ni(H2O)6]Cl2 | C) [Ni(H2O)4Cl2].2H2O | D) [Ni(H2O)6Cl2] -
What is the oxidation number of silver in the complex [Ag(NH3)2][Ag(CN)2]?
A) +1, +1 | B) 0, +2 | C) +1, -1 | D) +2, 0 -
What is the hybridization of Ni in the complex [Ni(CN)4]²⁻?
A) sp³ | B) dsp² | C) d²sp³ | D) sp³d² -
Which of the following statements is false for octahedral complexes?
A) Hybridization can be d²sp³ or sp³d² | B) Energy of eg orbitals increases | C) Hybridization is dsp² | D) Difference between t2g and eg is 10 Dq -
For which ions is the configuration identical (d³) in both SFL and WFL?
A) d⁵ | B) d⁶ | C) d⁷ | D) d³ -
Which of the following octahedral complexes will always be an outer orbital complex?
A) Zn²⁺ | B) Fe²⁺ | C) Fe³⁺ | D) Mn²⁺ -
What is the number of primary valencies in [Cr(NH3)4Cl2]Cl?
A) 1 | B) 2 | C) 3 | D) 4 -
How many ions will Potassium ferricyanide [K3[Fe(CN)6]] give in water?
A) 2 | B) 3 | C) 4 | D) 1 -
Facial (fac) and meridional (mer) isomerism is possible in which complex?
A) MA3B3 type | B) MA4B2 type | C) MA2B2 type | D) MA6 type -
The number of unpaired electrons in the octahedral complex [CoF6]³⁻ is?
A) 0 | B) 2 | C) 4 | D) 5 -
Which of the following ions will not pair up even with a strong ligand?
A) Fe²⁺ | B) Fe³⁺ | C) Cr³⁺ | D) Co³⁺ -
The complex [Cr(NH3)6][Co(CN)6] is an example of?
A) Coordination isomerism | B) Ionization isomerism | C) Linkage isomerism | D) None -
The geometry of which of the following will be Tetrahedral?
A) [Pt(CN)4]²⁻ | B) [Ni(CN)4]²⁻ | C) [NiCl4]²⁻ | D) All of the above -
What is the oxidation number of cobalt (Co) in K[Co(CO)4]?
A) 0 | B) -1 | C) +1 | D) +2 -
The relationship between crystal field splitting energy (Δt) and (Δo) is?
A) Δt = 4/9 Δo | B) Δt = 9/4 Δo | C) Δt = Δo | D) Δt = 0.5 Δo -
How many geometrical isomers are possible for the complex [Co(en)2Cl2]⁺?
A) 2 | B) 3 | C) 4 | D) 1 -
Which of the following complexes will be paramagnetic?
A) [Ni(CO)4] | B) [Ni(CN)4]²⁻ | C) [Fe(H2O)6]³⁺ | D) [Zn(NH3)4]²⁺
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