How can lymph be defined?

In how many ways can $7$ men and $7$ women be seated around a round table such that no two women sit together?

The maximum value of $xy$ subject to $x+y=7$ is

$AlCl_3$ is:

In the reaction of $BaO_2$ with dilute $H_2SO_4$,what are the oxidation states of the most electronegative element in the products?

$Assertion (A)$: van der Waals' forces are responsible for chemisorption. $Reason (R)$: High temperature is favourable for chemisorption. The correct answer is