Explanation

The phrase "at present" indicates an action happening right now, so present continuous tense is needed.

"Is reading" correctly shows the ongoing action with the subject 'She'.

Explanation

Meissner’s corpuscles are specialized mechanoreceptors that detect light touch and vibrations in the skin.

They are most abundant in fingertips, lips, and palms.

Explanation

Adipic acid has six carbon atoms with carboxylic acid groups at both ends — hence the name hexane-1,6-dioic acid.

It is a dicarboxylic acid.

It is widely used in the production of nylon.

Explanation

An ulcer is a gut disorder where the inner lining of the stomach or intestine becomes sore or eroded.

It often causes pain, bleeding, and discomfort, especially in the stomach or small intestine.

Explanation

DNA contains deoxyribose sugar, not ribose.

Ribose sugar is found in RNA, not in DNA.

Explanation

Milk has a pH around 6.5, making it slightly acidic compared to bread and egg.

Eggs and bread are closer to neutral or slightly basic, especially egg whites.

Explanation

NH₄⁺ (ammonium ion) is formed by a coordinate covalent bond between nitrogen and an extra hydrogen.

Within NH₄⁺, atoms are bonded by covalent bonds.

NH₄⁺ and Cl⁻ are held together by an ionic bond.

Explanation

The complex [Cu(en)2]^+² contains 2 ethylenediamine (en) ligands.

Each en is a bidentate ligand, donating 2 lone pairs, so:

2 ligands × 2 = 4 coordinate bonds → Coordination number = 4

Explanation

In the sentence, "the little one" refers to a person (child), making "one" a noun.

It is a common noun used in place of a name or identity.

Explanation

As temperature increases, the solubility of gases like oxygen and carbon dioxide in water decreases.

This happens because gas molecules gain energy and escape more easily from the liquid.