Which of the following is the weakest base?

$A$ lead shot of $1\, mm$ diameter falls through a long column of glycerine. The variation of its velocity $v$ with distance covered is represented by

Equilibrium constant for the reaction $H_2O_{(g)} + CO_{(g)} \rightleftharpoons H_{2(g)} + CO_{2(g)}$ is $81$. If the velocity constant of the forward reaction is $162 \ L \ mol^{-1} \ s^{-1}$,what is the velocity constant (in $L \ mol^{-1} \ s^{-1}$) for the backward reaction?

Which one of the following is not a correct statement?

How many glucose molecules are required for the formation of $52$ pyruvic acid molecules at the end of glycolysis?

Identify the equivalent logic gate for the following circuit.