Practice free Chemistry NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
All ligands are :
Ligands are species that donate a pair of electrons to a central metal atom or ion to form a coordination complex. According to Lewis theory, substances that donate electron pairs are called Lewis bases. Therefore, all ligands are Lewis bases.
The hybridization in $ Ni(CO)_4 $ is :
In the complex $ Ni(CO)_4 $, the nickel metal has a 3d^8 4s^2 electron configuration. When it forms the complex, it uses its 4s and 4p orbitals to hybridize into four $ sp^3 $ orbitals to accommodate the four CO ligands. Therefore, the hybridization in $ Ni(CO)_4 $ is $ sp^3 $.
A group of atoms can function as a ligand only when
A ligand must have at least one lone pair of electrons to donate to a central metal atom or ion to form a coordination bond. Therefore, a group of atoms can function as a ligand only when it has an unshared electron pair.
A complex compound in which the oxidation number of a metal is zero,is
In the complex compound $[Ni(CO)_4]$, the oxidation number of Ni is zero because CO is a neutral ligand. The oxidation state of Ni can be calculated as follows: Let the oxidation state of Ni be x. Since CO is a neutral ligand, its contribution to the overall charge is 0. Therefore, x + 4(0) = 0, which means x = 0.
A ligand can also be regarded as
A ligand is a Lewis base because it donates a pair of electrons to the central metal atom or ion to form a coordinate covalent bond.
The primary and secondary valencies of chromium in the complex ion,dichlorodi oxalato chromium (III), are
The number of unidentate ligands in the complex ion is called
The coordination number of a complex is defined as the number of unidentate ligands directly bonded to the central metal ion. For example, in the complex ion ext{[Co(NH}_3 ext{)}_6 ext{]}^{3+}, the coordination number of cobalt is 6 because it is bonded to six ammonia molecules.
The tetrahedral complexes have coordination number
Tetrahedral complexes have a coordination number of 4. This is because the central metal ion in such complexes is surrounded by four ligands. For instance, in the tetrahedral complex ext{[Ni(CO}_4 ext{]}, the nickel ion is coordinated to four carbon monoxide ligands.
The compound having lowest oxdation state of iron is.
The compound ext{[Fe(CO}_5 ext{]} has the lowest oxidation state of iron, which is 0. This is because carbon monoxide is a neutral ligand, and the sum of the oxidation states of the ligands is zero, leading to an overall oxidation state of zero for iron in this complex.
Ethylene diamine is an example of
Ethylene diamine (often abbreviated as en) is a bidentate ligand. This means it can form two bonds with a central metal ion, utilizing its two nitrogen atoms, each of which has a lone pair of electrons. This allows it to form chelate rings with the metal ion, increasing the stability of the complex.
Ready to ace NEET?
Free access · No credit card required
Yes. You can attempt every Chemistry question on this page for free without logging in, and check the correct answer with a detailed explanation instantly.
No account is required to attempt questions and view answers. A free account adds bookmarks, personal notes, and progress tracking.
The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.