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Please answer this question with complete explanation.

Please answer this question with complete explanation. 

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Grade:12th pass

1 Answers

Mahima Kanawat
1010 Points
2 years ago
Dear student
H2S will dissociate into H+ and S-2. For highly acidic medium, let take HCl, HCl will dissociate into Hand Cl-. Due to common ion effect of H+ , reaction will proceed in backward direction and as a result concentration of S-2 ion decreases, it will not combine with Cd+2 in appropriate amount and therefore will not precipitate .
WITH REGARDS 
MAHIMA 
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