The elements with atomic numbers $9, 17, 35, 53, 85$ are all

Which of the following pairs shows the highest bond dissociation enthalpy among halogens and the lowest bond dissociation enthalpy among hydrogen halides?

Which of the following oxoacids of chlorine is the least oxidizing in nature?

Write the redox reaction between fluorine and water.

Which of the following elements is in a liquid state at room temperature?

Aqua regia is a mixture of