What is the number of oxygen atoms bonded to chlorine in its strongest oxoacid?

Bromine is obtained on a commercial scale from

Which of the following statements is correct?

Chlorine acts as a bleaching agent only in the presence of

Which of the following is the correct decreasing order of oxidizing power of perhalate ions?

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A :$ Fluorine forms one oxoacid.
Reason $R :$ Fluorine has the smallest size amongst all halogens and is highly electronegative.
In the light of the above statements,choose the most appropriate answer from the options given below.