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Allotropes of Phosphorus

pH of aqueous...

Question

$p^{H}$ of aqueous $K_{2} S$ solution is:

A

> 7

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B

7

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C

< 7

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D

14

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Solution

The correct option is A $> 7$
$K_{2} S \to 2 K^{+} + S^{2 -}$
now $S^{2 -} + H_{2} O \to H_{2} S + O H^{-}$
$∴$ solution will turn basic due to generation of $O H^{-}$ .
$∴ p H > 7$

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Similar questions

Q. SET -1(pH value) SET-2(Solution)

7

A) Aqueous solution of 1M

N a O H

< 7

N a_{2} C O_{3}

> 7

C H_{3} C O O N H_{4}

14

The correct match is :

Q. Find the concentration of

H^{+}

ions in an aqueous solution, which is saturated with

H_{2} S

0.1 M

H_{2} C O_{3}

0.2 M

K_{1} = 10^{- 7}, K_{2} = 10^{- 14}

H_{2} S, K_{1} = 4 \times 10^{- 7}, K_{2} = 4 \times 10^{- 11}

H_{2} C O_{3}]

Q. Approximate pH of 0.1 M aqueous

H_{2} S

K_{1}

K_{2}

H_{2} S

25^{\circ} C a r e 1 \times 10^{- 7}

1.3 \times 10^{- 13}

Give one example each of a salt which gives an aqueous solution having :

(a) pH less than 7

(b) pH equal to 7

(c) pH more than 7

Q. Calculate the appoximate pH of

0.1 M

H_{2} S

K_{1}

K_{2}

H_{2} S

1.0 \times 10^{- 7}

1.3 \times 10^{- 13}

respectively at

25^{o} C

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