JEE MAIN - Chemistry (2024 - 8th April Morning Shift - No. 10)
Match List I with List II
| LIST I (Name of the test) |
LIST II (Reaction sequence involved) [M is metal] |
||
|---|---|---|---|
| A. | Borax bead test | I. | $$\mathrm{MCO}_3 \rightarrow \mathrm{MO} \xrightarrow[+\Delta]{\mathrm{Co}\left(\mathrm{NO}_3\right)_2} \mathrm{CoO} \cdot \mathrm{MO}$$ |
| B. | Charcoal cavity test | II. | $$\mathrm{MCO}_3 \rightarrow \mathrm{MCl}_2 \rightarrow \mathrm{M}^{2+}$$ |
| C. | Cobalt nitrate test | III. | $$\mathrm{MSO}_4 \xrightarrow[\Delta]{\mathrm{Na}_2 \mathrm{~B}_4 \mathrm{O}_7} \mathrm{M}\left(\mathrm{BO}_2\right)_2 \rightarrow \mathrm{MBO}_2 \rightarrow \mathrm{M}$$ |
| D. | Flame test | IV. | $$\mathrm{MSO}_4 \xrightarrow[\Delta]{\mathrm{Na}_2 \mathrm{CO}_3} \mathrm{MCO}_3 \rightarrow \mathrm{MO} \rightarrow \mathrm{M}$$ |
Choose the correct answer from the options given below:
Explanation
(A) Borax bead test
$$\mathrm{MSO}_4 \xrightarrow[\Delta]{\mathrm{Na}_2 \mathrm{~B}_4 \mathrm{O}_7} \mathrm{M}\left(\mathrm{BO}_2\right)_2 \rightarrow \mathrm{MBO}_2 \rightarrow \mathrm{M}$$
(B) Charcoal cavity test
$$\mathrm{MSO}_4 \xrightarrow[\Delta]{\mathrm{Na}_2 \mathrm{CO}_3} \mathrm{MCO}_3 \rightarrow \mathrm{MO} \rightarrow \mathrm{M}$$
(C) Cobalt nitrate test
$$\mathrm{MCO}_3 \rightarrow \mathrm{MO} \xrightarrow[+\Delta]{\mathrm{CO}\left(\mathrm{NO}_3\right)_2} \mathrm{CoO} \cdot \mathrm{MO}$$
(D) Flame test
$$\mathrm{MCO}_3 \rightarrow \mathrm{MCl}_2 \rightarrow \mathrm{M}^{2+}$$
So, $$\mathrm{A} \rightarrow$$ (III), $$\mathrm{B} \rightarrow$$ (IV), $$\mathrm{C} \rightarrow$$ (I), $$\mathrm{D} \rightarrow$$ (II).
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