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K2O can be prepared by (A) burning metallic potassium in air. (B) passing oxygen in liquid ammonia. (C) reducing KNO3 with metallic potassium.

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K2O can be prepared by 

(A) burning metallic potassium in air. 

(B) passing oxygen in liquid ammonia. 

(C) reducing KNO3 with metallic potassium. 

(D) reducing K2SO4 with porous graphite.

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(C) reducing KNO3 with metallic potassium

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