Chemistry Mixed Test

In K4[Fe(CN)6], the primary valency corresponds to the oxidation state of the central metal ion. Since the total charge of the complex is 0 and CN is -1, Fe + 6(-1) = -4, so Fe = +2.

EDTA (Ethylenediaminetetraacetic acid) is a hexadentate ligand because it has six donor atoms (four oxygens and two nitrogens) that can bind to a central metal ion simultaneously.

Polymers are macromolecules characterized by very high molecular weights. The statement that they have low molecular weight is false.

The complex [Pt(NH3)2Cl2] exhibits geometrical isomerism, having two isomers: the cis-isomer and the trans-isomer.

A complex is non-ionisable if there are no counter-ions outside the coordination sphere. In [CO(NH3)3Cl3], all ligands are inside the coordination sphere, so it does not ionize in water.

Geometrical isomerism requires different spatial arrangements of ligands. [CO(NH3)5NO2]Cl2 is an octahedral complex where all positions are occupied by NH3 or NO2, and it does not allow for cis/trans arrangements that result in distinct isomers.

Pi-bonded organometallic complexes involve pi-electron systems (like alkenes or aromatic rings) donating to the metal. Tetraethyl lead is a sigma-bonded organometallic compound.

[Cu(NH3)4]2+ has a dsp2 hybridization, which corresponds to a square planar geometry.

 All of the above given Hybridization : Molecular geometry are correctly matched.

The color of colloidal gold sol depends on the size of the dispersed particles, as different sizes scatter different wavelengths of light.

Lyophilic sols are solvent-loving and generally decrease the surface tension of the dispersion medium (water) when added.

Micelles are aggregates of surfactant molecules that form above a certain concentration, classifying them as associated colloids.

Mist is a colloidal system where liquid droplets are dispersed in a gas (air).

In the Langmuir adsorption isotherm, the rate of gas molecules striking the surface is directly proportional to the pressure of the gas.

Protective power is inversely proportional to the gold number. A lower gold number means higher protective power; therefore, the order is P > Q > R > S.

The Tyndall effect is the scattering of light by colloidal particles, which is a standard and simple way to distinguish a colloid from a true solution.

These complexes exhibit ionization isomerism because they produce different ions in solution (Br- vs SO4^2-).

The IUPAC name for Na3[Co(NO2)6] is sodium hexanitrocobaltate(III). The metal is in the anionic complex, so it ends in -ate.

Oxalate (C2O4^2-) is a bidentate ligand that can bind to a metal ion through two oxygen atoms, forming a ring structure known as a chelate.

In [Cr(H2O)4Cl2]+, the oxidation state of Cr is calculated as: Cr + 4(0) + 2(-1) = +1, so Cr = +3.

Fibres have strong intermolecular forces, such as hydrogen bonding or dipole-dipole interactions, which allow them to be drawn into long, thin threads.

Coordination isomerism occurs when both the cation and anion are complex ions and ligands can be exchanged between them. [Cr(NH3)6][Co(en)3] fits this definition.

[Fe(CN)6]3- involves a strong field ligand (CN-), which causes pairing of electrons, resulting in d2sp3 hybridization.

[Cu(NH3)4]2+ is a square planar complex, which corresponds to dsp2 hybridization for the central copper ion.