What will be the hydrogen ion concentration of $0.006 \ M$ benzoic acid? $(K_a = 6 \times 10^{-5})$

An acid solution of $pH=6$ is diluted $1000$ times,the $pH$ of the final solution becomes

For a $0.1 \ M$ solution of a weak acid $HQ$,the $pH$ is $3$. The ionization constant $K_a$ of the acid is:

The $pH$ of two equimolar weak acids are $3.0$ and $5.0$ respectively. Their relative strength is

The $pH$ of $0.01 \ M$ solution of acetic acid is $5.0$. What are the values of $[H^{+}]$ and $K_a$ respectively?

For a diprotic organic acid in aqueous solution,the ionization constants are $K_1 = 4.2 \times 10^{-7}$ and $K_2 = 4.8 \times 10^{-11}$. For a $0.034 \ M$ solution of this acid,select the correct statement.