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Graham's Law of Effusion

What is the c...

Question

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}

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

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

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

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Solution

The correct option is D $p H_{1} > p H_{2} > p H_{3} > p H_{4}$
Acidic character increases in the order
$H_{2} O < H_{2} S < H_{2} S e < H_{2} T e$
Basic character of conjugate bases will be in the order
$O^{2 -} > S^{2 -} > S e^{2 -} > T e^{2 -}$
More the basic character, more the pH
$∴$ pHs are in the order
$p H_{1} > p H_{2} > p H_{3} > p H_{4} .$

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(p H_{1}),

(p H_{2}),

p H_{3})

p H_{4})

(p H_{1})

(p H_{2})

(p H_{3})

(p H_{4})

p H

p H_{1}

p H_{2}

p H_{3}

p H_{4}

p H = (p H)_{1}

p H = (p H)_{2}

(p H)_{2} - (p H)_{1} =

(p H)_{1} + (p H)_{2} = 9.5 u n i t s

P h_{3} ¨ ⊖ C

P h_{2} ¨ ⊖ C H

P h ¨ ⊖ C H_{2}

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