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Decarboxylation

14. Assertion...

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14. Assertion-: In basic medium Zn2+ is not precipitated by H2S R-:Common ion effect reduces concentration of sulphide ion to minimum level

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Q. Assertion :In acidic medium,

Z n^{2 +}

is not precipitated by

S^{2 -}

ions. Reason: Common ion effect reduces the concentration of

S^{2 -}

ions to the minimum level.

S b^{3 +}

is not precipitated as sulphide when

H_{2} S

(g) is passed in alkaline solution.
Reason:

[S^{2 -}]

ion in basic medium is inadequate for precipitation.

S b (I I I)

is not precipitated as sulphide when in its alkaline solution

H_{2} S

is passed. Reason: Concentration of

S^{2 -}

ions in alkaline medium is inadequate for precipitation.

{S b}_{2} S_{3}

is not soluble in yellow ammonium sulphide. Reason: The common ion effect due to

S^{2 -}

ions reduce solubility of

{S b}_{2} S_{3}

.

Q. Assertion :When

H_{2} S

gas is passed into an aqueous solution of

Z n C l_{2}, Z n^{2 +}

ions are completely precipitated as zinc sulphide. Reason: Zinc sulphide is insoluble in solutions of caustic alkali but dissolves in dilute

H C I

.

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