Explanation

The body-centered cubic (BCC) unit cell is one of the common arrangements of atoms in crystalline solids. In this structure:

• Eight particles are located at the corners of the cube.
• One particle is situated in the center of the cube.

Explanation

• An element is a substance that consists of only one type of atom and cannot be further split up into simpler substances by chemical reactions.
• Examples: hydrogen (H), carbon (C), oxygen (O), and iron (Fe).

Explanation

Explanation

• In Al2Cl6, each chlorine atom shares two electrons with the aluminum atom, forming a covalent bond.
• This means that each chlorine atom donates two electron pairs to the bond.

Explanation

When ultraviolet radiation reacts with chlorofluorocarbons (CFCs), it results in the breakdown of the ozone layer by releasing chlorine radicals Cl° and C° F2Cl.

Explanation

• Halazone is a water purification tablet.
• It is used to disinfect water and make it safe for drinking.

Explanation

Compounds that have a small value of K have an affinity for the stationary phase.

Explanation

Most catalytic elements or their compounds belong to the d-block. 

d-block elements (transition metals):

These elements are known for their ability to participate in a wide variety of chemical reactions due to the availability of their d-orbitals. This allows them to act as catalysts by facilitating the formation of intermediate compounds and lowering the activation energy of reactions. 

Explanation

 In any mixture of gases, the sum of the mole fractions of all components is always equal to 1.

Explanation

 Leaving group ability:

A good leaving group is a species that can easily depart from a molecule taking a pair of electrons with it. 

Halide trend:

Among halogens (I, Br, Cl, F), iodide (I-) is the best-leaving group because it is the weakest base, meaning it is most stable with a negative charge.