Mole | MCQs

Explanation

sp hybridization: When one s orbital and one p orbital mix, they form two sp hybrid orbitals.

These hybrid orbitals are oriented linearly (180 degrees apart) from each other.

This linear geometry is characteristic of molecules with only two electron groups around a central atom.

Examples include acetylene (C2H2) and carbon monoxide (CO). 

Explanation

The ion that is not a molecular ion is b) NH4+. 

A molecular ion is formed when a molecule gains or loses an electron, but NH4+ (ammonium ion)

It is not formed by removing an electron from a neutral molecule; it is formed by adding a proton (H+) to ammonia (NH3).

He+ (helium ion) is also not a molecular ion because it consists of only one atom.

Helium is a noble gas and does not readily form covalent bonds with other atoms to create a molecule. 

Explanation

Hemoglobin is a large protein (macromolecule) made up of four polypeptide chains, each with a heme group.

It contains approximately 68,000 atoms, including carbon, hydrogen, oxygen, nitrogen, iron, and sulfur.

Explanation

The dipole moment of H₂O (water) is approximately 1.83 Debye.

This is due to the bent shape and the difference in electronegativity between hydrogen and oxygen.

Explanation

 In any mixture of gases, the sum of the mole fractions of all components is always equal to 1.

Explanation

At STP, 1 mole of any gas occupies 22.4 dm³.
If 11.2 dm³ = 0.5 mole →
0.5 mole of nitrogen (N₂) = 14 g
→ Full mole = 28 g (molecular mass of N₂)

Explanation

Ice (solid water) is formed from molecules held together by hydrogen bonds, making it a molecular solid.

Explanation

Explanation

In sp² hybridization, the unhybridized p orbital remains perpendicular to the plane formed by the sp² hybridized orbitals, contributing to the formation of a π bond.

Explanation

 Pyramidal molecular structure is typically found in molecules like ammonia (NH₃), where there is a central atom with lone pairs and three bonded atoms.