Explanation

When the size of solute particles decreases, the solubility of a solid in a liquid increases because:

Surface Area Effect: Smaller particles have a larger surface area exposed to the solvent, speeding up dissolution.

Kinetic Energy: More collisions occur between solute and solvent molecules, enhancing solubility.

Explanation

When alkalis react with fats, they produce soap and glycerin in a process called saponification.

Glycerin (also called glycerol) is a byproduct formed alongside soap.

Explanation

Convection is the transfer of heat through the movement of fluids (liquids or gases) due to differences in temperature and density.

It does not occur in solids as the particles in solids are not free to move.

Explanation

The dissolving of salt in water is a physical change because:

Reversible Process: The salt can be recovered by evaporating the water (no new substance is formed).

Molecular Level: Salt (NaCl) dissociates into ions (Na⁺ and Cl⁻) but retains its chemical identity.

Explanation

Phosphorus is used in the match industry, particularly red phosphorus.

It is a key component in the production of matchsticks.

It is highly reactive and helps ignite the match when struck.

Explanation

HNO₃ is the chemical formula for Nitric acid, a strong mineral acid commonly used in fertilizers and explosives.

It contains one hydrogen, one nitrogen, and three oxygen atoms.

Explanation

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

It is also known as Magnetite or Magnetic oxide.

Explanation

Water gas is a mixture of Carbon Monoxide (CO) and Hydrogen (H2).

Water Gas is formed when steam is passed over red-hot coke.

Formula: H₂O

Boiling point: 100°C

Explanation

They do not perform Baeyer's Test statement is not true because alkynes do perform Baeyer's Test, which detects unsaturation (like double or triple bonds).

In Baeyer's Test, potassium permanganate gets decolorized if alkynes are present, indicating a reaction.

Explanation

Most abundant element in Earth crust is Oxygen.

Oxygen in the crust is (46.1%).

The chemical formula of oxygen (dioxygen) is O2.

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List of 10 Most Abundant Elements in the Earth's Crust