Chemistry · Group 13 to Group 18 Elements
The metallic oxide of a divalent metal which on thermal decomposition liberates
The metallic oxide of a divalent metal which on thermal decomposition liberates oxygen is:
- A. \( C O_{2} \)
- B. \( P_{2} O_{5} \)
- C. \( H g O \)
- D. \( N_{2} \),
Step-by-step solution
Among the options, only HgO is a metallic oxide of a divalent metal (mercury has +2 oxidation state). On thermal decomposition, HgO decomposes to mercury metal and oxygen gas (2HgO → 2Hg + O₂), thus liberating oxygen. The other options are either non-metal oxides (CO₂, P₂O₅) or not an oxide (N₂).
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