Explanation

Explanation

In a neutral atom, the number of protons = electrons, ensuring electrical neutrality.

Protons are not always equal to neutrons or nucleons (protons + neutrons).

Explanation

The First Law of Thermodynamics states that energy can neither be created nor destroyed, only transformed from one form to another.

Hence, it is essentially the law of conservation of energy.

Explanation

Boyle’s Law: At constant temperature, pressure is directly proportional to density (P ∝ ρ).

This is because P ∝ 1/V, and since ρ = m/V, higher pressure means higher density for a fixed mass.

Explanation

The SI unit of impedance is the ohm (Ω).

Impedance, like resistance, is measured in ohms.

It can be represented as a complex number.

Explanation

The Kelvin scale is related to Celsius by: K = °C + 273.15.

Thus, 0°C = 273.15 K, which is the absolute temperature reference point.

Explanation

Curie (Ci) is a unit that measures the rate of radioactive decay.

1 Curie = 3.7 × 10¹⁰ disintegrations per second.

Explanation

PVC (Polyvinyl chloride) is a synthetic polymer made from repeating vinyl chloride monomers.

CH₄, SO₂, and CO₂ are simple molecules, not polymers.

Explanation

Salt (solute) dissolves in water (solvent) to form a homogeneous mixture called a solution.

The salt ions spread evenly throughout the water, making it uniform.

Explanation

Calcium carbonate + hydrochloric acid → calcium chloride (CaCl₂), water (H₂O), and carbon dioxide (CO₂).

This is a neutralization + decomposition type reaction of an acid with a carbonate.