The best replacement for calcium oxide is calcium hydroxide.


The best alternatives to calcium oxide are rated as following:
★★★★★  calcium hydroxide
★  calcium carbonate

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Speaking about calcium oxide, one probably shouldn't forget about carbon dioxide.

Other search terms related to calcium oxide and their ratings are:

★★★★★ carbon dioxide
silicon dioxide
sulfur dioxide
phosphorus pentoxide
sulphur dioxide
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Google Trends

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calcium oxide
calcium hydroxide
calcium carbonate