Explanation

Hydrochloric acid (HCl) reacts with Sodium hydroxide (NaOH) to form Sodium chloride (NaCl) and Water (H₂O) — a typical acid-base neutralization reaction.

The balanced equation is:

NaOH + HCl → NaCl + H₂O

Explanation

• A Neutralization reaction is a specific type of reaction where an acid and a base react to form a salt and water only, with no other products.
• This reaction is characterized by the elimination of acidic and basic properties, resulting in a neutral solution.
• Example: HCl (acid) + NaOH (base) → NaCl (salt) + H2O (water)

Explanation

When calcium carbonate (CaCO₃) reacts with dilute hydrochloric acid (HCl), it produces carbon dioxide (CO₂) gas.

The reaction is:

CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O

Explanation

Hydrogen and helium are the two lightest gases, both significantly lighter than air. 

Hydrogen: Considered the lightest gas.

Helium: Also lighter than air, but twice as heavy as hydrogen.

Air: Has a higher molecular weight than both hydrogen and helium. 

Explanation

Red phosphorus is the form of phosphorus used in safety matches.

It's found on the striking surface of the matchbox, not in the match head itself.

This design separation prevents the match from spontaneously igniting. 

Explanation

Cyclic ethers containing two ether groups are called crown ethers.

These compounds have a ring structure with multiple oxygen atoms, forming a "crown-like" shape that can bind to metal ions. 

Explanation

The kinetic molecular theory states that gases are made up of small particles called molecules.

These molecules are in constant random motion and collide with each other and the container walls.

Explanation

A compound is a pure substance formed when two or more different elements chemically combine in a fixed ratio.

Examples include water (H₂O) and carbon dioxide (CO₂).

Explanation

An alkali is a base that dissolves in water to give hydroxide (OH⁻) ions.

Common examples include sodium hydroxide (NaOH) and potassium hydroxide (KOH).

Explanation

A reducing agent, also known as a reductant.

It is a substance that causes another substance to be reduced by donating electrons to it.

In the process, the reducing agent itself becomes oxidized, as it loses electrons.

This means that the reducing agent's oxidation state increases.