According to the reactivity series, the reactivity of calcium is the highest among the given metals. Thus, calcium forms oxides readily. Calcium is a soft metal and thus its oxide is basic in nature. The chemical formula of calcium oxide is CaO. Therefore, the correct answer is option (b) Ca. 12. When compared, the Gº for the formation of Al₂O₃, the Gº for the formation of Cr₂O₃ is (AIPMT 2008) (a) same (b) unpredicted (c) higher (d) lower The standard change in free energy is always negative. Aluminium can be used as a reducing agent to obtain chromium by reduction. Thus, numericall
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