When water is added to calcium oxide, we get calcium hydroxide which turns pink on addition of phenolphthalein. Predict the nature of calcium oxide.

Basic

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Neutral

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Acidic

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Amphoteric

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Solution

The correct option is A
Basic

Calcium oxide is a metallic oxide and metallic oxides are basic in nature. On addition of phenolphthalein, colourless solution changes to pink.

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The reaction of calcium oxide with water to form calcium hydroxide is an example of:

Question 06.
Calcium phosphate is present in tooth enamel. Its nature is
(a) basic
(b) acidic
(c) neutral
(d) amphoteric

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