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Identify A, B and C in the given below reaction sequence
Given below are two statements :
Statement (I) : Nitrogen, sulphur, halogen and phosphorus present in an organic compound are detected by Lassaigne's Test.Statement (II) : The elements present in the compound are converted from covalent form into ionic form by fusing the compound with Magnesium in Lassaigne's test.
In the light of the above statements, choose the correct answer from the options given below :
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:
During the detection of acidic radical present in a salt, a student gets a pale yellow precipitate soluble with difficulty in $$\mathrm{NH}_4 \mathrm{OH}$$ solution when sodium carbonate extract was first acidified with dil. $$\mathrm{HNO}_3$$ and then $$\mathrm{AgNO}_3$$ solution was added. This indicates presence of :
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