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(i) Here is the balanced chemical equation when XeF₂ undergoes hydrolysis,

Xenon difluoride reacts with water to form Xenon, Hydrogen fluoride and oxygen.

(ii) Here is the balanced chemical equation when MnO₂ is heated with conc. HCl

Chlorine Gas(Cl), Manganese(II) Chloride and(MnCl₂) and Water(H₂O) is obtained when Manganese(IV) Oxide reacts with conc. HCl.

OR

(i) Increasing acidic character is

In binary acids, as the size of the element increases the bond becomes weaker and hence become a better acid due to easy release of H⁺ ion.

(II) Decreasing bond enthalpy is

Because as the size of halogen decreases the effective nuclear charge increases and hence, the bond enthalpy increases.