For a weak acid $HA$,$pK_a = 4.80$. For a weak base $BOH$,$pK_b = 4.78$. What is the $pH$ of an aqueous solution of the salt $BA$?

Which of the following aqueous solutions will have a $pH$ less than $7.0$?

Which oxychloride has maximum $pH$?

The $pK_a$ of a weak acid,benzoic acid and $pK_b$ of a weak base,ammonium hydroxide are $4.25$ and $4.75$ respectively. Then the $pH$ of $0.1 \ M$ solution of ammonium benzoate will be

$pK_a$ of acetic acid is $4.74$. The concentration of $CH_3COONa$ is $0.01 \ M$. The $pH$ of $CH_3COONa$ is

The $pH$ of water is $7$. When a substance $Y$ is dissolved in water,the $pH$ becomes $13$. The substance $Y$ is a salt of......