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Which one is correct group reagent for group cations?
(a) \( \mathrm{Mn}^{2+} \mathrm{Co}^{2+} \mathrm{Zn}^{2+} \mathrm{Ni}^{2+} ; \mathrm{HCl}+\mathrm{H}_{2} \mathrm{~S} \)
(b) \( \mathrm{Mn}^{2+} \mathrm{Co}^{2+} \mathrm{Zn}^{2+} \mathrm{Ni}^{2+} ; \) dil. \( \mathrm{HCl} \)
(c) \( \mathrm{Mn}^{2+} \mathrm{Co}^{2+} \mathrm{Zn}^{2+} \mathrm{Ni}^{2+} ; \mathrm{NH}_{4} \mathrm{Cl}+\mathrm{NH}_{4} \mathrm{OH} \)
(d) \( \mathrm{Mn}^{2+} \mathrm{Co}^{2+} \mathrm{Zn}^{2+} \mathrm{Ni}^{2+} ; \mathrm{NH}_{4} \mathrm{Cl}+\mathrm{NH}_{4} \mathrm{OH}+\mathrm{H}_{2} \mathrm{~S} \)
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