Explanation

Hydrolysis of one mole of ATP to ADP and inorganic phosphate releases approximately 7.3 Kcal of energy.

This energy is used to power various biological processes in cells.

Explanation

Alkanes are saturated hydrocarbons containing only single covalent bonds between carbon atoms.

They follow the general formula CnH2n+2.

It include compounds like methane, ethane, and propane.

Explanation

A nucleophile is a chemical species that is attracted to positive charges, especially the nucleus.

It donates a pair of electrons to form a chemical bond, often attacking electrophilic centers.

Explanation

Alkenes are commonly known as Olefins due to their ability to form oily liquids when reacting with chlorine.

They are unsaturated hydrocarbons containing at least one carbon-carbon double bond (C=C).

Explanation

Barium (Z = 56) → Electron configuration:

[Xe]6s²

Barium's electron distribution:

• K = 2
• L = 8
• M = 18
• N = 18 ⬅ Penultimate shell (4th shell / N-shell)
• O = 8 (valence shell)

The penultimate shell (N-shell) holds 18 electrons in Barium.

Explanation

Step 1: Calculate the molar mass of S8

The atomic mass of sulfur (S) is approximately 32 g/mol. The molar mass of S8 = 8 * 32 = 256 g/mol.

Step 2: Calculate the number of moles of S8

Number of moles = mass of S8 / molar mass of S8 = 64 g / 256 g/mol = 0.25 mol.

Step 3: Calculate the number of molecules of S8

Number of molecules = number of moles * Avogadro's number (NA) = 0.25 * NA.

Step 4: Calculate the number of sulfur atoms

Each molecule of S8 contains 8 sulfur atoms. Therefore, the total number of sulfur atoms = 8 * number of molecules = 8 * 0.25 * NA = 2 * NA = 2NA.

Explanation

The verb "consider" is used without "as" when followed by a noun or adjective complement.

"Foolish" is the correct adjective.

Explanation

اسم نکرہ اس اسم کو کہتے ہیں جو کسی غیر معین چیز یا شخص کی نشان دہی کرے، جیسے "پرندہ"۔

بلبل ایک اسم معرفہ ہے کیونکہ یہ خاص پرندے کا نام ہے۔

Explanation

"The" is used to refer to something specific or already known to the listener.

Since "blue T-shirt over there" is a specific item, "the" is the correct article.

Explanation

To find acceleration, we use the formula:

a = (v - u) / t

where:

v = final velocity = 15 m/s

u = initial velocity = 10 m/s

t = time = 4 seconds

a = (15 - 10) / 4

= 5 / 4

= 1.25 m/s²