Sigma bonds are formed as a result of the overlapping of which type of atomic orbital

Sigma bonds are formed as a result of the overlapping of atomic orbitals that overlap end-to-end.

Explanation:

Sigma bonds are formed by the end-to-end overlap of hybrid orbitals with hybrid orbitals, hybrid orbitals with non-hybrid orbitals and non-hybrid orbitals with non-hybrid orbitals. The most common combinations that produce sigma bonds are:

Hybrid orbitals - Hybrid orbitals

Hybrid orbitals - Non-Hybrid orbitals

Non-Hybrid orbitals - Non-Hybrid orbitals

b. acid is the correct answer @jayxboof all social media

acid : acids are those which accepts an electron-pairs.

base : bases are those which donates ab electron-pairs.

alkali : it is a base that dissolves in water. it is basically a base and the ph greater than 7.

hydroxide ion : it is a poly-atomic ion which is negatively charged.

it's filtration, but this is an assumption so my apologies if i got this