Explanation

Sulfuric acid (H₂SO₄) is called the "King of Chemicals" or "King of Compounds" due to its wide use in industries like fertilizers, batteries, and detergents.

It plays a key role in chemical manufacturing.

It is often used to measure a country's industrial strength.

Explanation

Balancing the equation requires equal atoms of each element on both sides.

Here, 2 molecules of KNO₃ decompose into 2 molecules of KNO₂ and 1 molecule of O₂ gas.

Explanation

Condensation is the process where water vapor in clouds cools down as it moves through colder regions, turning into liquid water (rain) or solid ice (snow).

This process is a key part of the water cycle.

Explanation

Anode: The electrode where oxidation (loss of electrons) occurs.

It releases electrons into the circuit.

Cathode vs. Anode:

Cathode: Reduction (gain of electrons) occurs here.

Anode: Always the site of oxidation in both galvanic (voltaic) and electrolytic cells.

Explanation

The symbol ⁴₂He indicates helium has 2 protons (atomic number = 2) and mass number = 4.

In a neutral atom, the number of electrons = protons, so helium has 2 electrons.

Explanation

Vertical columns in the periodic table are called groups.

Horizontal rows are called periods.

Explanation

In HNO₃ (nitric acid):

Hydrogen (H) = +1

Oxygen (O) = -2 (×3 = -6)

Let nitrogen = x

So, +1 + x + (−6) = 0

⇒ x = +5

Nitrogen has an oxidation state of +5 in HNO₃.

Explanation

Fe3O4 occurs as a mineral with a chemical name Iron (II, III) oxide.

It is also known as Magnetite or Magnetic oxide.

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

Diamond is a non-metal with a high-density.

Graphite: A non-metal but has a lower density (~2.2 g/cm³).

Hydrogen: The lightest element with very low density (~0.000089 g/cm³).

Helium: Also very low density (~0.00018 g/cm³).

Diamond: A non-metal form of carbon with high density (~3.5 g/cm³).

Iron: A metal, so not a valid choice for a non-metal category.