Which one of the following halogens liberates oxygen,when passed through hot concentrated $KOH$ solution?

If the pair of straight lines given by $A x^2+2 H x y+B y^2=0$ $(H^2>A B)$ forms an equilateral triangle with the line $a x+b y+c=0$,then $(A+3 B)(3 A+B)$ is equal to :

The abundance of a species population within its habitat is called

Name the chronic respiratory disorder caused mainly by cigarette smoking.

The point collinear with $(1, -2, -3)$ and $(2, 0, 0)$ among the following is

Which of the following substances acts as both an oxidizing agent and a reducing agent?