Which salt has a ph < 7? kbrhcookcaso4nh4no3

has pH<7

Explanation:

pH of salt depends on species generated through hydrolysis of the given salt.

Hydrolysis equilibrium of is given below:

is a weak base and is a strong acid. So species obtained through hydrolysis of is a mixture of strong acid and weak base.

Hence the the salt solution will be acidic in nature. That means pH of solution is less than 7.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

i believe the answer is a.