Identify the no. of correct statements?

1) $\text{E .A :- S\hspace{0.17em}> Se\hspace{0.17em}> Te\hspace{0.17em}> Po\hspace{0.17em}> O}$

2) $\text{M. Pt :- O\hspace{0.17em}<\hspace{0.17em}S <\hspace{0.17em}Se < Po <\hspace{0.17em}Te}$

3)  acidic character increases from ${\text{H}}_{2}O$ to $H_{2}Te$ .

4)  thermal stability of hydrides also decreases from ${\text{H}}_{2}O$ to $H_{2}Po$

5) Ozone and sulphur dioxide are gases while selenium dioxide is solid.

(1) Because of the compact nature of oxygen atom, it has less negative electron gain enthalpy than sulphur. However, from sulphur onwards the value again becomes less negative up to polonium.

(2) The melting and boiling points increase with an increase in atomic number down the group. 

(3) acidic character increases from H₂O to H₂Te. as  bond enthalpy for the dissociation of H–E bond decrease down the group.

(4) As enthalpy for the dissociation of H–E bond decreases down the group, the thermal stability of hydrides also decreases.

(5) Ozone (O₃ ) and sulphur dioxide (SO₂ ) are gases while selenium dioxide (SeO₂ ) is solid.