What is the correct relationship between the pHs of isomolar solutions of sodium oxide ( pH ₁ ) , sodium sulphide ( pH ₂ ) , sodium selenide ( pH ₃ ) and sodium telluride ( pH ₄ ) ?

Step-by-step solution

The correct order of pH of isomolar solution in sodium oxide ( pH ₁ ) , sodium sulphide ( pH ₂ ) , sodium selenide ( pH ₃ ) and sodium telluride ( pH ₄ ) is pH ₁ pH ₂ pH ₃ pH ₄ because in aqueous solution, they are hydrolysed as follows. Na ₂ O +2 H ₂ O Base 2 NaOH + H ₂ O Na ₂ ~S +2 H ₂ O Strong base 2 NaOH + Weak acid H ₂ ~S Na ₂ Se +2 H ₂ O Strong base 2 NaOH + gathered H ₂ Se Weak acid gathered Na ₂ Te +2 H ₂ O Strong base 2 NaOH + gathered H ₂ Te Weak acid gathered Order of acidic strength H ₂ Te H ₂ Se H ₂ ~S