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Concentration Terms - An Introduction (w/w etc)

Test tube A c...

Question

Test tube A contains ${Z n C l}_{2}$ aqueous solution while test tube contains ${C d C l}_{2}$ solution. On passing $H_{2} S$ gas :

Z n S

is precipitated

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C d S

is precipitated

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both (a) and (b) are precipitated

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None of the above is precipitated

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Solution

The correct option is B $C d S$ is precipitated
Test tube A contains ${Z n C l}_{2}$ aqueous solution while test tube contains ${C d C l}_{2}$ solution. On passing $H_{2} S$ gas $C d S$ is precipitated as the value of the solubility product of CdS is much lower than the value opf the solubility product of zinc sulphide.

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