Butyne is an alkyne, characterized by a triple bond between carbon atoms.

Physisorption involves weak Van der Waals forces, and the adsorption of water on silica gel is a classic example of this type of adsorption.

Not all p-block elements are metals; many are nonmetals and metalloids.

Transition metals generally have high density, not low density.

The conjugate of a complex number a + bi is a - bi. Thus, the conjugate of 2 - 3i is 2 + 3i.

The conjugate of a complex number a + bi is a - bi. Thus, the conjugate of 5 - 3i is 5 + 3i.

Acceleration is defined as the change in velocity per unit time, so its dimensional formula is [M^0 L^1 T^-2].

Frequency has the dimensional formula [M^0 L^0 T^-1].

Aldehydes contain the functional group -CHO, which is characterized by a carbonyl group (C=O) bonded to a hydrogen atom.

P2O5 is the most acidic oxide among the given options, as it forms phosphoric acid in water.

Formic acid (HCOOH) is the strongest carboxylic acid among the given options due to the presence of a hydrogen atom directly attached to the carbonyl carbon, which increases its acidity.

The unit of pressure is Pascal (Pa), which is equivalent to N/m².

CN- is a strong field ligand that causes a large splitting of d-orbitals, leading to low-spin complexes.

Iron is a ferromagnetic material, which means it can be magnetized and has a high magnetic permeability.

Iron is considered a ferromagnetic material, which can be magnetized and retains its magnetism.

Water (H2O) has a polar covalent bond due to the difference in electronegativity between hydrogen and oxygen.

Water (H2O) has a polar covalent bond due to the difference in electronegativity between hydrogen and oxygen.

Neodymium (Nd) and Plutonium (Pu) are both f-block elements.

The mass of an electron is significantly less than that of protons and neutrons.

The electron has the least mass compared to protons and neutrons.

Substituting (0, -4) into the equation gives 4(0) - 5(-4) + 20 = 0, which is true.

Condensation is the process where gas changes to liquid.

Free expansion is an irreversible process as it occurs without any external pressure acting on the gas.

An isochoric process is one that occurs at constant volume.

Velocity is a vector quantity as it has both magnitude and direction, while mass, temperature, and speed are scalar quantities.

The azimuthal quantum number (l) describes the shape of an orbital.

H2O → H2 + O2 involves the oxidation of water to hydrogen and oxygen, making it a redox reaction.

Carbon (C) acts as a reducing agent as it donates electrons to reduce Fe2O3 to Fe.

Carboxylic acids are more acidic than alcohols due to the resonance stabilization of their conjugate base, making the statement 'They are less acidic than alcohols' incorrect.

Adsorption is a surface phenomenon as it occurs at the interface between phases.