Explanation

Ferromagnetic materials are those that can be magnetized and retain their magnetization even after the external magnetic field is removed.

These materials have a high magnetic permeability and strong interactions between magnetic moments, which align in the same direction.

Explanation

In the complex  [Ni(CN) 4] ^2−, nickel is in the +2 oxidation state and is surrounded by four cyanide (CN⁻) ligands.

According to Crystal Field Theory and based on the strong field nature of cyanide ligands, the complex adopts a square planar geometry.

Explanation

Natural rubber is primarily composed of polyisoprene, a polymer made up of isoprene monomers.

Isoprene (2-methyl-1,3-butadiene) is a diene compound that polymerizes to form the long chains found in natural rubber.

Explanation

This is done through an electrophilic attack on the aromatic ring with the help of a carbonation.

The Friedel-Crafts alkylation reaction is a method of generating alkylbenzenes by using alkyl halides as reactants.

The Friedel-Crafts alkylation reaction of benzene is illustrated below.

Explanation

Alpha rays, or alpha particles, are the least penetrating form of radiation.

They consist of two protons and two neutrons.

Making them relatively large and heavy compared to beta and gamma rays.

Explanation

According to Valence Shell Electron Pair Repulsion (VSEPR) theory, XeF₄ (xenon tetrafluoride) has a square planar geometry.

Xenon in XeF₄ has six electron pairs around it: four bonding pairs and two lone pairs.

Explanation

The Tyndall effect is the scattering of light by particles in a colloid or in very fine suspensions.

When light passes through a colloidal solution, the dispersed particles scatter the light in different directions, making the path of the light visible.

Explanation

Osmium is the densest naturally occurring element, with a density of approximately 22.59 g/cm³.

This makes it the highest density transition element, far exceeding the densities of elements like mercury and zinc.

Explanation

a synonym of the word "urbane" is "sophisticated," which means پرفاخر

Explanation

Synonym of the word "paucity" is "scarcity" which means کمی