Match List I with List II and select the correct answer using the codes given below the Lists: 1. List I: I. German Silver, II. Solder, III. Bleaching Powder, IV. Hypo 2. List II: A) Tin, B) Nickel, C) Sodium, D) Chlorine Codes:

The question requires matching substances/materials with a key element or component. 1. German Silver is an alloy of copper, zinc, and importantly, nickel. (I matches B) 2. Solder is a fusible metal alloy used to create a permanent bond between metal workpieces. Soft solder typically consists of tin and lead. (II matches A) 3. Bleaching Powder is primarily calcium hypochlorite (Ca(OCl)2), which contains chlorine as the active bleaching agent. (III matches D) 4. Hypo is a common name for sodium thiosulfate (Na2S2O3·5H2O), used in photographic fixing. It contains sodium. (IV matches C) Therefore, the correct matching is I-B, II-A, III-D, IV-C.