Verified Solution • 2025–26 Session moderate

QJEEM24Ch9dc0: JEE Main 2024 Chemistry - Class 12 JEEM24Ch9dc0 Solution: Match List I with List II .tg…

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. MCO3→MO→+ΔCo(NO3)2CoO⋅MO\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. MCO3→MCl2→M2+\mathrm{MCO}_3 \rightarrow \mathrm{MCl}_2 \rightarrow \mathrm{M}^{2+}
C. Cobalt nitrate test III. MSO4→ΔNa2 B4O7M(BO2)2→MBO2→M\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. MSO4→ΔNa2CO3MCO3→MO→M\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:

Multiple Choice Options

  • A A-III, B-I, C-IV, D-II
  • B A-III, B-IV, C-I, D-II
  • C A-III, B-II, C-IV, D-I
  • D A-III, B-I, C-II, D-IV

Step-by-Step Verified Solution

(A) Borax bead test

MSO4→ΔNa2 B4O7M(BO2)2→MBO2→M\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

MSO4→ΔNa2CO3MCO3→MO→M\mathrm{MSO}_4 \xrightarrow[\Delta]{\mathrm{Na}_2 \mathrm{CO}_3} \mathrm{MCO}_3 \rightarrow \mathrm{MO} \rightarrow \mathrm{M}

(C) Cobalt nitrate test

MCO3→MO→+ΔCO(NO3)2CoO⋅MO\mathrm{MCO}_3 \rightarrow \mathrm{MO} \xrightarrow[+\Delta]{\mathrm{CO}\left(\mathrm{NO}_3\right)_2} \mathrm{CoO} \cdot \mathrm{MO}

(D) Flame test

MCO3→MCl2→M2+\mathrm{MCO}_3 \rightarrow \mathrm{MCl}_2 \rightarrow \mathrm{M}^{2+}

So, A→\mathrm{A} \rightarrow (III), B→\mathrm{B} \rightarrow (IV), C→\mathrm{C} \rightarrow (I), D→\mathrm{D} \rightarrow (II).

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