Mole | MCQs

Explanation

A gene is a segment of DNA that carries the genetic instructions used in the growth, development, and reproduction of organisms.

It is the fundamental unit of heredity.

Explanation

Explanation

A covalent bond forms when two atoms share one or more pairs of electrons.

This type of bonding typically occurs between non-metal atoms to achieve stable electron configurations.

Explanation

The empirical formula shows the simplest whole-number ratio of atoms in a compound (e.g., CH₂O for glucose).

It does not reflect the actual number of atoms like the molecular formula does, just their simplest ratio.

Explanation

Hydrogen bonding occurs when hydrogen is bonded to highly electronegative atoms like fluorine, oxygen, or nitrogen.

HCl does not form hydrogen bonds because chlorine is not electronegative enough to form such interactions with hydrogen.

Explanation

Ammonia (NH₃) has a trigonal pyramidal shape due to one lone pair on the nitrogen atom.

The molecular geometry results from sp³ hybridization and lone pair-bond pair repulsion.

Explanation

 Coal gas composition:

Typically contains around 50% hydrogen, 35% methane, and 10% carbon monoxide. 

Production method:

Coal is heated in the absence of air to produce these gases. 

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

Micro molecules (or small molecules) have low molecular weight, like glucose or amino acids.

Macromolecules are large molecules like proteins, carbohydrates, and nucleic acids.

Explanation

A vector is a DNA molecule used to carry a gene of interest into a host cell for cloning.

Common vectors include plasmids, bacteriophages, and cosmids.