Chemistry · Periodic trends in properties of elements: atomic and ionic radii, ionization enthalpy, electron gain enthalpy, valence, oxidation states and chemical reactivity
Select correct statement.
Select correct statement.
- A. Based on reactivity series, occurrence of certain elements takes place in native state
- B. Due to basic nature of oxides of alkaline earth elements, they combine with atmospheric acidic oxides giving salts
- C. Both (a) and (b) are correct
- D. None of the above is correct
Step-by-step solution
Statement A is correct because the reactivity series dictates that less reactive metals like gold and silver occur in native state. Statement B is correct because alkaline earth oxides are basic and react with atmospheric acidic oxides like CO2 to form salts (e.g., CaO + CO2 → CaCO3). Therefore, both statements are true.