Which of the following oxoacids of phosphorus has the lowest oxidation state of phosphorus?

The number of common tangents to the two circles $x^2+y^2-8x+2y=0$ and $x^2+y^2-2x-16y+25=0$ is:

The reactivity of borazole is higher than that of benzene because ...

What does the given experimental set-up depict?
Choose the correct option accordingly.

Given below are two statements regarding silent heart attack.
Statement $I$: This type of heart attack shows symptoms like chest pain and shortness of breath.
Statement $II$: In this type of heart attack,usually person shows very mild symptoms and thus it is ignored.
In the light of above two statements,choose the correct answer from options given below.

The hybridisation of $Xe$ and the number of lone pairs of electrons on it in $XeF_6$ are