An aqueous solution of borax is

(a) neutral (b) amphoteric

(c) basic (d) acidic

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Solution

(c) Borax is a salt of a strong base (NaOH) and a weak acid (H₃BO₃). It is, therefore, basic in nature.

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

Select from the following list:

$F e_{2} O_{3}, N O, P b O, M n_{2} O_{7}$ .

(a) Basic oxide...........

(b) Amphoteric oxide ...........

(d) Neutral oxide...........

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