Explanation

The volume of an atom is typically calculated using the atomic radius and the formula for the volume of a sphere (V = (4/3)πr³), where r is the atomic radius.

The atomic radius is the distance from the nucleus to the outermost electron orbital.

Explanation

Milk is a mixture, not a compound — it contains water, fats, proteins, etc., physically combined.

Chalk (CaCO₃), Ammonia (NH₃), and Table Salt (NaCl) are pure compounds with fixed chemical formulas.

Explanation

Nitrobenzene reacts slower than benzene in electrophilic substitution due to the electron-withdrawing nitro group.

The NO₂ group deactivates the benzene ring, making it less reactive toward electrophiles.

Explanation

Explanation

Explanation

Two species are isoelectronic if they have the same number of electrons.

N₂ has 14 electrons (7 from each nitrogen atom).

CN⁻ also has 14 electrons (6 from carbon, 7 from nitrogen, and 1 extra due to the negative charge).

Explanation

Sulfur and nitrogen compounds in the atmosphere can combine with water and oxygen to form sulfuric acid and nitric acid, leading to acid rain.

Acid rain is a type of precipitation that contains high levels of sulfuric and nitric acid, which can harm the environment, infrastructure, and human health.

Explanation

Aluminum (Al) reacts with oxygen to form a thin protective oxide layer (Al₂O₃) that prevents further oxidation.

This is why it doesn’t react aggressively with oxygen after this initial reaction.

Explanation

Explanation