The least number of oxyacids are formed by

Which of the following oxyacids of chlorine has the highest thermal stability?

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

$A$ greenish-yellow gas reacts with an alkali metal hydroxide to form a halate which can be used in fireworks and safety matches. The gas and halate are,respectively:

$Cl_{2}O_{7}$ is the anhydride of

Which of the following elements is the most basic?