Explanation

A glucoside bond (glycosidic bond) is a type of covalent bond that links sugar molecules in disaccharides and polysaccharides.

Lactose, a disaccharide, consists of glucose and galactose joined by a β-1,4-glycosidic bond.

Explanation

To convert kilometers per hour (km/h) to meters per second (m/s), multiply by 1000/3600:

72 km/h = 72 × (1000/3600)

= 72 × 5/18

= 20 m/s

Explanation

NH₄Cl (Ammonium chloride) contains three types of chemical bonds:

• Covalent bond → Between N (Nitrogen) and H (Hydrogen) in the NH₄⁺ (Ammonium ion).
• Coordinate (Dative) bond → Between N and one of the H atoms, where nitrogen donates a lone pair.
• Ionic bond → Between NH₄⁺ (Ammonium ion) and Cl⁻ (Chloride ion).

Explanation

Explanation

Each human lung contains approximately 300 million alveoli, providing a large surface area for gas exchange.

These tiny air sacs help in the efficient exchange of oxygen and carbon dioxide in the lungs.

Explanation

Explanation

The size of a class interval is calculated as:

Class Size = Upper Boundary - Lower Boundary

For (1 - 4): 4 - 1 = 3

Explanation

To expand the expression:

(√3 - √2)²

= (√3)² - 2(√3)(√2) + (√2)²

= 3 - 2√6 + 2

= 5 - 2√6

Explanation

The correct phrase is "excused for", which is used when someone is forgiven for a mistake or fault.

Example: He cannot be excused for his incompetence in handling the project.

Explanation

When two lines intersect, they form four angles around the intersection point.

The sum of these four angles is always 360°, as they complete a full circle.