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What is the correct relationship between the pH values of isomolar solution of Na₂O(pH₁), Na₂S(pH₂) Na₂Se(pH₃) and Na₂Te(pH₄)?

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pH₁ < pH₂ < pH₃ < pH₄

pH₁ > pH₂ > pH₃ > pH₄

pH₁ < pH₂ < pH₃ = pH₄

pH₁ > pH₂ = pH₃ > pH₄

answer is B.

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Detailed Solution

When the given solution dissolves in water, they gives the following reactions:

${Na}_{2} O + 2 H_{2} O ⟶ 2 NaOH + H_{2} O {Na}_{2} S + 2 H_{2} O ⟶ 2 NaOH + H_{2} S {Na}_{2} Se + 2 H_{2} O ⟶ 2 NaOH + H_{2} Se {Na}_{2} Te + 2 H_{2} O ⟶ 2 NaOH + H_{2} Te$

Acidity of hydrides of oxygen family increases down the group because of increasing in the atomic size of the elements.

H₂Te >H₂Se > H₂S > H₂O

Higher the acidic character, lower is the pH value.

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