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Comprehension-10: (Q. 34 to Q. 36)
For the purpose of systematic qualitative analysis, cations are classified into various groups on the basis of their behavior against some reagents. The group reagents used for the classification of most common cations are hydrochloric acid, hydrogen sulphide, ammonium hydroxide, and ammonium carbonate. Classification is based on whether a cation reacts with these reagents by the formation of precipitates or not. Which one among the following pairs of ions cannot be separated by \( \mathrm{H}_{2} \mathrm{~S} \) in the presence of dilute hydrochloric acid?
(a) \( \mathrm{Bi}^{3+}, \mathrm{Cd}^{2+} \)
(b) \( \mathrm{Al}^{3+}, \mathrm{Hg}^{2+} \)
(c) \( \mathrm{Zn}^{2+}, \mathrm{Cu}^{2+} \)
(d) \( \mathrm{Ni}^{2+}, \mathrm{Cu}^{2+} \)
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