Answer:
(a)
Calcium phosphateis
basic salt, as it is a salt of weak acid (phosphoric acid) and slightly
stronger base (calcium hydroxide) (though both are weak). Also when pH of our
mouth falls below 5.5 due to eating of sweets etc., i.e., mouth is acidic, the
dissolution of enamel (calcium phosphate) starts which shows that calcium phosphate
is basic in nature.
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