To an aqueous solution containing ions such as $Al^{3+}, Zn^{2+}, Ca^{2+}, Fe^{3+}, Ni^{2+}, Ba^{2+}$ and $Cu^{2+}$,concentrated $HCl$ was added,followed by $H_{2}S$. The total number of cations precipitated during this reaction is/are:
- A$4$
- B$1$
- C$3$
- D$2$
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$A$ mixture of two salts is not water-soluble but dissolves completely in dilute hydrochloric acid to form a colourless solution. The mixture could be
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Compound $X$ is tested and the results are shown in the table. Test Result Aqueous $NaOH$ is added, then heated gently. Gas given off which turns damp red litmus paper blue. Dilute $HCl$ is added. Effervescence, gas given off which turns lime water milky and acidified $K_2Cr_2O_7$ paper green.
Which ions are present in compound $X$?
| Test | Result |
| Aqueous $NaOH$ is added, then heated gently. | Gas given off which turns damp red litmus paper blue. |
| Dilute $HCl$ is added. | Effervescence, gas given off which turns lime water milky and acidified $K_2Cr_2O_7$ paper green. |
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