Identify the inorganic substance which on heating liberates oxygen, turns an acidic solution of KI brown, and also reduces acidified KMnO₄ solution.
Correct answer: D. H2O2
- A. NaNO3
- B. Pb (NO3)2
- C. ZnO
- D. H2O2
Explanation
Hydrogen peroxide (H₂O₂) decomposes upon heating to release O₂. It acts as an oxidizing agent with KI to produce I₂ (brown colour) and as a reducing agent with KMnO₄ (decolorizing it).
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About s-Block and p-Block Elements
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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