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.

Explanation

"Hour" begins with a silent h, so it sounds like it starts with a vowel.

Therefore, we use "an" before "hour" — "150 miles an hour."

Explanation

Explanation

A dull black surface absorbs maximum radiation because it doesn’t reflect or transmit light.

Such surfaces are used in experiments and devices like blackbody radiators for accurate heat absorption.

Explanation

Step 1: Calculate the value of √0.0121

√0.0121 = √121 × 10^-4 = 11 × 10^-2= 0.11

Step 2: Calculate the value of (0.1)²

(0.1)^2 = 0.01

Step 3: Compare the values

√0.0121 = 0.11

0.12

(0.1)^2 = 0.01

The largest value is 0.12.

Explanation

Formula:

Gravitational Potential Energy (GPE) = m × g × h

Where:

m = mass = 12 kg

g = gravitational acceleration = 9.8 m/s²

h = height = 5 m

GPE = 12 × 9.8 × 5 = 588 J