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Match each element in Column-I with its correct properties in Column-II. Column-I: (A) Ba (B) Pb (C) Ag (D) Ca Column-II: (P) Its cation in solution gives a brick-red precipitate with CrO4²- ions. (Q) Its cation in solution gives a yellow precipitate with CrO4²- ions. (R) Its salt gives an apple-green colour in a flame test. (S) Its salt gives a brick-red colour in a flame test. (T) Its cation in solution gives no precipitate with CrO4²- ions. Select the correct matching.

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

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

Solution

Ag2CrO4 is brick red (P -> C/Ag); BaCrO4 and PbCrO4 are yellow (Q -> A/Ba and B/Pb); Ba gives apple green flame (R -> A/Ba); Ca gives brick red flame (S -> D/Ca); CaCrO4 is soluble so no ppt (T -> D/Ca). The best match among the given options is option 1.

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