$$Pb{X_2} < < Sn{X_2} < < Ge{X_2} < < Si{X_2}$$

$$Ge{X_2} < < Si{X_2} < < Sn{X_2} < < Pb{X_2}$$

$$Si{X_2} < < Ge{X_2} < < Pb{X_2} < < Sn{X_2}$$

$$Si{X_2} < < Ge{X_2} < < Sn{X_2} < < Pb{X_2}$$

H₃PO₃ is a stronger acid than H₂SO₃

In aqueous medium HF is a stronger acid than HCl

HClO₄ is a weaker acid than HClO₃

HNO₃ is a stronger acid than HNO₂

HClO₃ and Cl₂O

HClO₂ and HClO₄

HCl and Cl₂O

HCl and HClO₃

Each silicon atom is surrounded by four oxygen atoms and each oxygen atom is bonded to two silicon atoms

Each silicon atom is surrounded by two oxygen atoms and each oxygen atom is bonded to two silicon atoms

Silicon atoms is bonded to two oxygen atoms

there are double bonds between silicon and oxygen atoms