Complete and balance the following reaction: K2O+H2O=?

Q. Complete and balance the following reactions:
(a) $Xe{F}_4+Sb{F}_5\to$ __________
(b) $CIF+H_{2}O⟶$ _________
(c) $Xe{F}_4+H_{2}O⟶$ ________ + _________

Q. Complete the following reactions and balance them: [5 MARKS]
(i) $P{b}_3{O}_4+HCl\to$
(ii) $ZnS+HCl\to$
(iii) $K_{2}O+HCl\to$
(iv) $KMn{O}_4+HCl\to$
(v) $HN{O}_3+HCl\to$

Q. Complete the following reaction:
$K_{2}C{O}_3+HCl\to$___________

Q. ${\left[Mn{O}_4\right]}^{2-}+H^{+}⟶$A$+{\left[Mn{O}_4\right]}^{-}+H_{2}O$.
Identify the compound $A$.