Explanation

The word "atom" comes from the Greek word "atomos," meaning "indivisible."

It was coined by ancient Greek philosopher Democritus to describe the smallest, indivisible particles that make up matter.

Explanation

Sulphur is widely used in the chemical industry, especially in making explosives like gunpowder.

It is also used in producing sulfuric acid, which is a key industrial chemical.

Explanation

Natural gas is a key feedstock for fertilizer production.

Approximately 29% of the country's natural gas consumption is utilized in the manufacture of fertilizers.

Explanation

• Sulfur dioxide (SO₂) and Nitrogen dioxide (NO₂) (nitrogen oxides, NOₓ) cause acid rain.
• These gases are mainly released from burning fossil fuels.
• SO₂ dissolves in rainwater to form sulfuric acid (H₂SO₄).
• NO₂ dissolves in rainwater to form nitric acid (HNO₃).

Last updated 18-07-2026 by NA

Explanation

Acids are not slippery; instead, they usually have a sour taste and can be corrosive.

Bases are the ones that feel slippery to touch.

Explanation

Rose petals act as a natural pH indicator.

They turn blue in alkaline (basic) solutions due to pigment changes.

Explanation

Ozone (O₃) is a triatomic molecule of oxygen, not a noble (rare) gas.

Radon, Xenon, and Krypton are all noble gases found in Group 18 of the periodic table.

Explanation

Explanation

Materials are classified based on how they conduct heat.

- Conductors: Allow heat to pass through easily (e.g., metals like copper, iron).

- Insulators: Do not allow heat to flow through easily.

- Examples of insulators: Wood, plastic, rubber, glass.

- Used in cooking handles, thermal flasks, and electrical wire coatings.

Explanation

An anion is a negatively charged ion.

H⁻ (hydride ion) carries a negative charge, so it is an anion.