Is HSO4 polar or no polar

It is polar

Explanation:

Hydrogensulfate is an oxoanion of sulphur , conjugate base of a sulfuric acid and conjugate acid of a sulfate

Please see the structure of HSO4 in the attached image

Polar molecules have  electronegativity difference between the bonded atoms.

In case of Hydrogensulfate, hydrogen is positive while sulfate is negative ion.

Electronegativity of hydrogen is 2.2 while that of sulfur and oxygen is 2.58 and 3.44 respectively

Thus, it is a polar molecule.

i'm assuming that the correct answer is indeed the first one/ "a"..

a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.