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. )?

Question

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. )? (A) pH 1> pH 2 ≈ pH 3> pH 4 (B) pH 1< pH 2< pH 3< pH 4 (C) pH 1< pH 2< pH 3 ≈ pH 4 (D) pH 1> pH 2> pH 3> pH 4

Tardigrade Admin · Accepted Answer

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 longrightarrow underset text Base 2 NaOH + H 2 O Na 2 S +2 H 2 O longrightarrow underset textStrong base 2 NaOH + underset textWeak acidH 2 S Na 2 Se +2 H 2 O longrightarrow underset textStrong base2 NaOH + underset text Weak acidH 2 Se Na 2 Te +2 H 2 O longrightarrow underset textStrong base2 NaOH + underset text Weak acidH 2 Te Order of acidic strength H 2 Te > H 2 Se > H 2 S > H 2 O Order of neutralisation of NaOH H 2 Te > H 2 Se > H 2 S > H 2 O Hence, their aqueous solutions have the following order of basic character due to neutralisation of NaOH with H 2 O , H 2 S . H 2 Se and H 2 Te Na 2 O > Na 2 S > Na 2 Se > Na 2 Te (∵ pH of basic solution is higher than acidic or least basic solution.)

Q. What is the correct relationship between the pHs of isomolar solutions of sodium oxide $(p H_{1})$ , sodium sulphide $(p H_{2})$ , sodium selenide $(p H_{3})$ and sodium telluride $(p H_{4}$ )?

$p H_{1} > p H_{2} \approx p H_{3} > p H_{4}$

$p H_{1} < p H_{2} < p H_{3} < p H_{4}$

$p H_{1} < p H_{2} < p H_{3} \approx p H_{4}$

$p H_{1} > p H_{2} > p H_{3} > p H_{4}$

Q. What is the correct relationship between the pHs of isomolar solutions of sodium oxide (pH1​), sodium sulphide (pH2​), sodium selenide (pH3​) and sodium telluride (pH4​ )?

pH1​>pH2​≈pH3​>pH4​

pH1​<pH2​<pH3​<pH4​

pH1​<pH2​<pH3​≈pH4​

pH1​>pH2​>pH3​>pH4​

Q. What is the correct relationship between the pHs of isomolar solutions of sodium oxide $(p H_{1})$ , sodium sulphide $(p H_{2})$ , sodium selenide $(p H_{3})$ and sodium telluride $(p H_{4}$ )?

$p H_{1} > p H_{2} \approx p H_{3} > p H_{4}$

$p H_{1} < p H_{2} < p H_{3} < p H_{4}$

$p H_{1} < p H_{2} < p H_{3} \approx p H_{4}$

$p H_{1} > p H_{2} > p H_{3} > p H_{4}$