Explanation

You have often heard me speak of my friend, Wahaj Waheed, who is a barrister here.

This sentence is grammatically correct with proper punctuation, capitalization, and structure.

Explanation

She has beauty, brains, and wealth-a rare combination.

This sentence is correct because it uses a dash (-) to connect the two independent clauses, indicating a strong break between them.

The dash emphasizes that "a rare combination" is a conclusion or a consequence of the preceding clause.

Explanation

The reaction of HCN with formaldehyde is a nucleophilic addition reaction, where the cyanide ion (CN⁻) acts as a nucleophile.

It attacking the electrophilic carbonyl carbon of formaldehyde to form a cyanohydrin.

Explanation

Hydrocarbons do not have a tendency to form hydrogen bonding.

Because they lack highly electronegative atoms like oxygen or nitrogen that are necessary for hydrogen bonds.

In contrast, carboxylic acids, ammonia, and ethyl alcohol can all engage in hydrogen bonding due to their functional groups.

Explanation

The correct electronic configuration for carbon is 1s²2s²2p².

Indicating it has 6 electrons: 2 in the 1s orbital, 2 in the 2s orbital, and 2 in the 2p orbital.

Explanation

Mass spectrometry is used to determine the type and relative amounts of isotopes in an element by measuring the mass-to-charge ratio of ionized particles.

This helps identify different isotopes based on their mass differences.

Explanation

The function of the Golgi complex is processing of cell secretions.

It modifies, sorts, and packages proteins and lipids produced in the endoplasmic reticulum for secretion or for use within the cell.

Explanation

The causative organism of measles is paramyxovirus.

Specifically, the measles virus belongs to the Paramyxoviridae family.

It is responsible for causing the highly contagious disease characterized by fever and a red rash.

Explanation

Due to the process of follicle atresia, the follicle degenerates.

Atresia is the breakdown of immature ovarian follicles, which prevents them from maturing and ovulating.

Explanation

Instantaneous velocity at any point on a curved path is directed tangentially to the curve.

It indicating the direction of motion at that moment.