Chemistry (General Concepts) MCQs with Answers

One-liner

The physical association of water with ions is called hydration.

One-liner

All of the given molecules—HF, H₂O, and NH₃—can form hydrogen bonding among themselves, so the correct answer is All of these can form hydrogen bonding.

One-liner

The IUPAC name of Vinyl acetylene is But-1-en-3-yne.

One-liner

The oxidation state of oxygen in OF2 is +2 because fluorine is more electronegative than oxygen.

One-liner

Standard enthalpy change is measured at 298 K (25°C), which is the standard thermodynamic reference temperature.

One-liner

In qualitative analysis, the sample may be solid, liquid, gas or a substance.

One-liner

An orbital that possesses lower energy than the atomic orbitals from which it is formed is called a bonding orbital.

One-liner

The ability of a substance to undergo a chemical change is called reactivity.

One-liner

Oxygen cannot be detected directly in a given organic compound and is usually determined by difference after all other elements are accounted for.

One-liner

The melting points and boiling points of transition elements increase up to the middle of the 3d-series due to stronger metallic bonding from increasing unpaired d-electrons.