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Chemistry Chemistry Difficulty: Medium

Total number of naturally occurring elements

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Hydrogenolysis results in the formation of________________? The elements with atomic numbers 9, 17, 35, 53, 85 are all Match List-I with List-II and select the correct answer: List-I List-II a. Morphine 1. Antiseptic b. Sodium 2. Alloy c. Boric acid 3. Analgesic d. German silver 4. Kerosene oil Which one of the following matches is not correct? Vitamin B 12 deficiency causes pernicious anaemia. Animals cannot synthesise vitamin B 12 . Humans must obtain all their vitamin B 12 from their diet. The complexing metal ion in Vitamin B 12 is.