Explanation

A catalyst speeds up a chemical reaction without being consumed in the process.

It lowers the activation energy, allowing the reaction to occur faster.

Explanation

Genghis Khan founded and led the Mongol Empire in the early 13th and 14th centuries.

It was the largest contiguous land empire in history.

Founded: 1206

Date dissolved: 1368

Explanation

Given a and b are integers and b ≠ 0:

a/b represents a Rational number.

A rational number is a number that can be expressed as the ratio of two integers, where the denominator is non-zero.

Explanation

Total parts = 2 + 3 + 5 = 10

Salma's share = (2/10) × 2000 = 400.

Explanation

Any non-zero number raised to the power of 0 equals 1.

So, 10⁰ = 1.

Explanation

Curious means شوقین

Explanation

Pakistan has three branches of government:

1. The Legislative Branch makes the laws.
2. The Executive Branch carries out the laws.
3. The Judiciary Branch evaluates and interprets the laws.

The Legislative Branch, or Parliament, has two houses: the National Assembly and the Senate

1. National Assembly: It makes laws for the federation and keeps a check over the Executive. 

2. The Senate is the body that represents the provinces and promotes a feeling of equality, peace, and harmony.

Explanation

De Morgan's first law states that the complement of the union of two sets A and B is equal to the intersection of their complements.

The correct representation is:

(AUB)' = A' ∩ B'

Explanation

The Arrhenius theory (1887) defines:

Acids: Substances that dissociate in water to produce H⁺ ions (protons), such as:

HCl → H⁺ + Cl⁻

Bases: Substances that dissociate in water to produce OH⁻ ions (hydroxide ions), such as:

NaOH → Na⁺ + OH⁻

Explanation

The set-builder form A = {x | x ∈ ℤ ∧ x² = 25} means x is an integer whose square is 25.

The integers satisfying this are x = -5 and x = 5, so A = {-5, 5}.