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Match each reagent/test in Column I with its correct observation in Column II. Column I: (A) NO2- + dil. H2SO4 + FeSO4(aq), (B) S2- + Na2[Fe(CN)5NO], (C) Flame test of Ba2+, (D) Pb2+ + excess NaOH Column II: (P) Purple colour in solution, (Q) Brown ring formation, (R) Colourless solution formed, (S) Apple green colour flame, (T) A complex compound is the product

1. (A)-(Q), (B)-(P), (C)-(S), (D)-(T)
2. (A)-(R), (B)-(T), (C)-(S), (D)-(P)
3. (A)-(Q), (B)-(T), (C)-(S), (D)-(R)
4. (A)-(P), (B)-(Q), (C)-(R), (D)-(S)

Correct answer: (A)-(Q), (B)-(P), (C)-(S), (D)-(T)

Solution

A-Q (brown ring for NO2-), B-P (purple with nitroprusside and S2-), C-S (apple green flame for Ba2+), D-T (Pb(OH)2 dissolves in excess NaOH forming [Pb(OH)4]2-).

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